<human>: I (19/f) have an ex (21/M) who I'm very attracted to, but broke up with because I always felt inadequate around him.  He has a need to care for others, to be above them, to always be the one giving advice and help when others need it.  It's going to sound crazy, but I always think he feels like it's a "privilege" to be receiving his aid.  He has a way of making you feel very small, and I lost all of my confidence while I was with him for four months.  

He actually broke up with me because I was trying too hard to be the girl he always wanted (he told me that his "disatisfactions" with our relationship could never be fixed), and he was sparing me the effort. 

A month later and after much confidence building, I was an idiot and decided to have a fwb situation with him.

Now I'm finding that I'm starting to feel small and inadequate again, so I should probably stop sleeping with him.

My question to you all is, though, how do I end it without making myself vulnerable?  If it was anyone else, I'd tell them how I was feeling and that I'd like to end it.  

I have a feeling he'll just swoop in and start offering his care though.  I fear he'll apologize for the way he made me feel, ask if there's a way to change it, and start comforting me for hurting me again.  

For the love of God, I just want to stop feeling so small and stupid, and I feel like such an idiot for letting him get to me this way.  

Anyway,

Can you summarize the given text in a few sentences?
<bot>: Ex has a need to be above others and bestow his help upon those in need.  I want to stop having a fwb with him, but I don't want to feel even smaller than I already am.