Intrusive horrible thoughts about boyfriend's past

Hi everyone! I'm new to this site & I have come here in hopes of getting advice from people with similar experiences to mine or simply people who can give me advice reguardless.

I have been diagnosed for many years now with acute bi polar, anxiety, panic attacks, & depression. Recently I have been battling with severe intrusive thoughts. I've been dating my boyfriend for a year now who has actually been my best friend for 8 years. Over all that time you can imagine I have heard a lot of stories about his sexual experiences with girls in details sadly. He lied to me a lot in the beginning of our relationship to get me jealous supposedly & for me to think he was "cool" and "experienced" & said a lot of things he said about girls when we were friends were exaggerated, not true & to get me jealous but he did admit the stuff that was true.

Since the beginning of our relationship obviously i'd think from time to time about this stuff & it'd get me upset obviously because he use to say a lot of stuff such as he's had 3 somes, had sex with over 10 girls, and a bunch of other things to me and all of the rest of our friend group which is mostly guys. In the beginning I'd bring it up & be upset & he'd just say that wasn't him anymore but as time went on I began having extreme intrusive thoughts.

He said about 6 months into our relationship that mostly everything was a lie that he said when we were friends & he thought I'd forget about it which is why he never admitted to it but I'm still confused as to if he said it was a lie just because I was getting so out of control with my emotions that he thought if he said it was a lie it'd calm me down. My intrusive thoughts are horrible I can't stop imagining him with his past hook up's & ex's doing crazy sexual things & it makes me cry so much & feel so sick. The worst part like I mentioned is I know the details & I know who all these girls are from pictures & seeing a few of them. I just think so much of stuff he probably did with them & it's sickening. I feel very compulsive to ask many questions & I just keep asking the same question because I always want to make sure the answers line up & because I'll swear in my head that I'm imagining all the answers he's given me & I constantly need to be hearing them again.

Then along with the intrusive images I will think of situations in which he may also be lieing in. I think the lieing & me knowing so much details from when we were friends has impacted me greatly because in previous relationships I've never been this way. Also to add my boyfriend is extremely jealous & obsessive with me and other guys whereas I'm just obsessive of intrusive thoughts in my head because I'm not worried or jealous of him with other girls at all.

I also have intrusive thoughts lately of going crazy. Say if im in a car I'll be thinking non stop what if I jump out? Or if I'm watching horror movies which I use to love that I might end up like the killer & kill people. Any help would be appreciated!