depressed boyfriend broke up with me out of the blue...help!

hi there. my boyfriend broke up with me properly about a week and a half ago. we had been together for almost a year and were together once before about 7 years ago for 2 years.
first off, let me explain how we got back together. he had been traveling for a year overseas and we started talking again online and on skype. after a few months of that, he decided firmly in his mind that he wanted to come back for me (and my daughter -who isn't his by blood- but shared an incredible bond as he met her when she was 3 months old, until she was 2) and get married, start extending our family, etc etc. he came back and for the ENTIRE year, everything was going PERFECTLY..or so it seemed... we had been talking of our future, getting really excited, he asked my parents for my hand in marriage, he started planning our wedding and all sorts. i think thats when it started going downhill. i had never pushed for marriage, i was never even phased whether or not we ever did get married, as i had already committed myself and did not need documents to prove that, but i was excited all the same. he started distancing himself towards me, my daughter and my family. still friendly and bubbly, but just not himself.
on new years day, we decided we would quit smoking together and from day one he was nasty and irritable. (which is a completely expected thing when quitting). we didnt really fight (we never did, a petty argument here and there, but we would get over it within minutes). then he started distancing himself even more. i went away for a week to visit family and i could tell something was not right. when he came to pick me up, he had a meltdown in the car. he said he didnt care about anything anymore. he doesnt want to be with me and believes he cannot be a good father. that he doesnt want any responsibility and he doesnt want me to rely on him. he said he loved me like he loves his family and childhood friends, but not the way i should be loved. that i deserve more, etc. i was calm and trying to talk sense into him. i couldnt even understand where any of it was coming from. i was prepared to move on then and there. i told him to drive me home and ill pick up my things from his place when i got the chance. before dropping me off, he parked on the side of the road, got out and started beating his head with his fists. i told him to stop making a scene and drop me home already. before leaving, he said he was crying out for help. that he was depressed and didnt want to feel the way he was feeling anymore. i told him i would help him find someone to talk to and that i would be there for him. he apologised and the next day told me that it was a meltdown and nothing more. he went to the doctor and got a referral to a psychologist. he told me he wanted everything to go back to normal and still wants everything that we had originally planned together, just with some added help from the psych.
i was confused, but more than happy to help him get through this. after all, i had committed myself to him and i wanted to be there for him. exactly one week later, he broke up with me. (which was roughly a week and a half ago now). He said he needs to figure himself out and he needs to do that alone. that he doesnt deserve anyone. that he is a bad partner and would be a bad father. that he cannot stop lying. that he still doesnt care about anything. he has made sure i know that none of it was my fault. he told me he wants me to move on and that hes sorry etc. he also asked to be friends....but i dont think i can be friends with someone when i love them so.
but how can i move on? i dont know what to do. i spent the first 3 days unable to get out of bed crying once my daughter was at school. ive been seeing friends and making plans, focusing on my daughter and making her happy. just trying to keep busy so i dont have to think about it. he seems so cold and distant. i understand that he doesnt care about anything at the moment, but how can he just cut me off so easily? i have dedicated myself to him and want so badly to help him through such a difficult time in his life. i know i need to give him space and let him figure all this out on his own, but it is so hard to accept.
any advice would be appreciated.

i dont really use capitals or apostrophes or basically any proper grammar when typing, unless i have to of course. I know how to use it perfectly, i just choose not to.. out of sheer laziness i guess? i dont see the massive dilemma people have with it. i also find it more aesthetically pleasing to read as the words are all fluent. when i write on paper, its always with correct grammar. when im on my PC, i basically dont care...its just the internet...
anyway, thanks for your words of advice. i guess i shall just continue pushing forward. i was hoping maybe i could get some advice on whether i should stay in contact with him or not? i mean, i want to be there to support him and i guess i would rather have him in my life as a friend than not at all, though at the same time, i feel like im only doing that as a way to try and hold onto hope for a future with him, when deep down i know there is none. there is just so much going on in my head at the moment, that i have no idea what im even doing. im also an unmedicated bipolar II. i dont know if that has any significance in the way im handling this at the moment, sometimes i get confused on what is actually driving me, rationality or my bipolar. maybe i need to go and see my psych again...