IM SORRY this is long but help please 

I started seeing this guy about 2 months ago. We’ve been casually hanging out and doing on “dates” and stuff (I hesitate to call them dates because I don’t know how he really feels about me and ugh idfk) and we’ve had sex a lot of times (I’m very hypersexual and also use sex as a way of making sure they stay with me, and as a form of validation)
So anyway lol I’ve been seeing him and I just don’t know how to take things slow or how to tell if he actually likes me or if he’s just hanging out with me casually for sex. He told me he likes me, we’ve talked seriously and also joked about running away together. I really like him and want sooo bad for him to call me his girlfriend. But I don’t even know how to tell if he actually is interested in me. 
I analyze all of his facial expressions when we’re together and it seems like he’s annoyed with me but I don’t know if that’s even my perception or not.  and im am always checking my phone to see if he texts me. He didn’t text me for like a day and a half and I COMPLETELY split on him. 
I think I keep trying to come up with reasons whyhe actually hates me/is gonna leave me. I guess I’m so scared that I’m trying to mentally prepare myself for when he eventually leaves cuz I’m shit. 

Should I tell him I have BPD? Should I ask him if we’re exclusive? I feel like he’s faking it and this is all a joke being played on me. But I also know that’s my perception. But it’s sooo hard to see reality for what it is.
Im trying to look at the facts. Today he started texting me again after not texting me for like 2 days. He told me he misses me which made me think maybe he does actually like me. My world brightened up when he said that.

I have had a lot of relationships with bad endings, narcissistic partners etc. I have no idea how to take things slow, I go from 0 to 100 and feel intense love for the person within a week. And when someone doesn’t reciprocate I split on them. My emotions/mood depends entirely on if they’re communicating with me or not and how that communication feels to me.

Can anyone relate? How do u deal with these intense feelings???