Hey Kaca,
First thing I would do would be to call up your doctor and get back on some meds to even out the rough spots. Explain to your boyfriend that Depression is a physical disease, caused by a chemical imbalance in the brain. For some reason, your brain chemistry is not working correctly and you need medication(s) to correct the imbalance. It affects your emotions and behavior, but is not caused by it. Your boyfriend is no more at fault for your imbalance than I am. The condition will not go away, but can be controlled with the proper medication. Make it clear that no one is at fault, no more so than if someone gets cancer. It happens. When it does happen, it affects your moods, which nobody else has any control over. You just have to keep reminding your BF that he is NOT responsible for your moods, good or bad. Just make sure you are extremely careful taking your medication exactly as prescribed and things should get better.
Keep us updated.
Leigh Ann