I have a new friend, who I see just about every day. We work out together almost every day, and hang out after like a third of the time. 

I like spending time with him. A lot, actually. But I don't know where to draw the line between "friends" and "obsessed". On top of that, I kind have a wall up around him because I'm scared that I'll cross that line. I'm worried that I'm gonna start fixating on him, and that hes going to become my new FP.  Which is something I so don't want. I've gone 6months w/o a FP, and I'd like to keep it that way thank you very much. 

Any tips on maintaining a close friendships without getting obsessed? Should I tell him about my BPD? Just... help? 