Basically I’ll try to make a long story short. 

I met my now fp 3 years ago. He’s always been interested in me. Literally his own words, he’s “fangirled over me for years.” I wasn’t super interested, I would talk to him here and there. Until a few months ago. I fell hard and fast. We both wanted a relationship and it was headed towards one. Then my BPD kicked in. I told him I only wanted to be friends and nothing more. Obviously this was a total lie just because I was afraid of being abandoned. About a week later I tried to explain it to him and tell him that I very much did want to be with him. Now he thinks I’m just “inconsistent and raising red flags.” I’ve been doing my absolute best to try to be consistent since then and still putting in effort. Now at this point he thinks he’s bad for me and now good enough for me for some odd reason. 

What do I do at this point to prove that I actually want this? 

If it helps, he has bipolar disorder and I think he’s going through an episode now which explains the whole “I’m not good enough for you and it would be bad and I would hurt you in the end” vibe that he’s trying to give me now.