He doesn’t trust me cause his ex was a liar?

Yyyeah, bringing baggage into a relationship and making it your SO's problem is pretty high on my list of not-cool behavior.

I can tell you from first hand experience that if they have a hang up from another relationship it'll be hard to get them to break it. My experience wasn't about lies, but about her ex was a drug addict that would pawn her things to get money for drugs. I have never done them and never pawned anything of mine, let alone stealing from someone else. But every time something would be misplaced, she'd accuse me, then find it later that day or the next. Never once apologizing for the false accusations. This went on and off for years. I just thought it would stop at some point. It didn't.

Being away from that has made things so much better. If you can't talk to him and get him to stop, it probably won't stop at all. Joking or not, it's still going to eat at you.

This will go nowhere. Nip that in the bud now.

If he's not over his ex then he needs to stop wasting your time and giving you grief.. Types like that just get more psycho and controlling

Need to set him straight and if he keeps that up then break up. It is energy-sucking to deal with someone with issues like that.

I would cut him lose

{@loveallot12] it really sounds like this guy has been hurt in a previous relationship . until he straightens his head out no relationship after is going to work i am afraid it sounds like you are a scapegoat for what has gone before

I honestly think you're picking up cues of a looming issue soon to be a mushroom cloud in the horizon.

This feels like you're being led into a relationship with someone who is so damaged, that they're seeking a hostage.

Major red flags.
I'd stay well away from anyone who's as paranoid as that.
They turn out to be possessive, jealous, controlling, abusive and downright dangerous.

girl i’d just leave. i’ve learned sticking around for someone who hasn’t healed is pointless.

That’s a disaster waiting to happen.

Better get out while you can

I'd call it quits now.sorry to hear it.

His ex may(or may not) have lied to him. Even if she did, that's not your damn problem. Distancing would be a great idea.