I’m 43 but not too old to know what I went through at your age…
Your boyfriend would say he likes the smell of your morning or garlic breath, would say it’s fine for you to change the channel to whatever you want even in the middle of his ball game, would think it’s cute when you sample food off his plate while eating out at a restaurant, would compliment all the new clothes and think it’s humorous about all the shoes you have (I’ll stop here) at your age I bet. There is payoff for him and if it’s a new relationship you’re still making yourself look as good as you can (still hiding flaws maybe) in front of him waiting for your payoff…”payoff” is whatever for different people.
Your bother is more honest about what bothers him…and I’ll take your side but I bet you’ve done some things in the past that he still holds a grudge about…could be attention from parents, jealously about grades, any number of things…point is he’s telling you how it really is because there’s no “payoff” for him. (you’ll always be his sister), value what his reactions are because it is honestly what others might feel but would never tell you to your face.
thinking back to my relationship with my sister when I was your age , I was the younger brat and she was the older (only 3 years) "hen"--always in my business...I guess I was looking at a way where you could give even when he didn't deserve in order to open up doors of communication. Sometimes, however, sibling rivalry is not that easy.
But do look at his side and reactions as an honest gauge at what extra sacrifices you may have to do because you have this disease…I get up at 3-4 am while on vacation with family when in a hotel room so I can be out of the bathroom by 6 so my wife and kids don’t have to sacrifice their vacation because I need the bathroom at my disposal…the rest of the time I try to use the lobby restroom in order not to sink up our hotel room.
I’m saying, because you have UC, you may have to sacrifice more and limit how late you can be out or what you can eat or wake up earlier (or give a gift) because, like it or nor/fair or not, you have something that limits the amount of fun you can have compared to someone with no chronic illness.
I don’t want to burden someone; if anything I want to make it advantageous for people to be my friend…or husband, or Dad, or brother…not bribe but fair
My sister and I have a great relationship now…living in a house with one bathroom where you need more time…I’m saying you may need to sacrifice in other ways or there will be resentment.