BF projecting his insecurities onto me

My partner of a year and a half has been projecting his insecurities about his body/past relationships onto me.

At first I was understanding, we were a fresh relationship and his last one was incredibly toxic. We talked things through, I reassured him I'm not the kind of person to violate trust or hurt somebody intentionally. He promised to work on it. A year and a half later he still gets jealous and accuses me of talking to other guys, he asked me if I was hooking up with a friend of mine that directed a photoshoot I modelled in, and he often feels too bad about his body to have sex, despite me constantly telling him he's sexy, that I want him, and that he's more than enough for me. He even told me he searches for things I do that could hurt him, and that he's just waiting for me to "lie" to him like "every woman" he's loved before.

To be honest, those things are incredibly hurtful to hear and I'm wearing a bit thin trying to fill his emotional cup. I've offered to help him find a therapist who could better help him process his traumas and self esteem issues but he refuses to actually put the work in himself. I've been nothing but faithful, patient, and kind to him and yet he'll tell me I'm playing dumb when I don't understand what sort of scenario he's made up to accuse me of, and then when I express that I'm hurt he would ever think of me to do that, he sends me away and says he needs "time to heal".

Right now he's back in his hometown seeing family for two weeks and has been gone since Monday. Already he's accused me of cheating on him because I didn't respond to his texts for a few hours (I had a migraine) and yet since then he's texted me only a handful of times despite me reaching out, and he only facetimed me once for a few minutes but didn't have anything to say. I feel awful admitting this but I don't even miss him and I feel as though it's time for us to part ways.

I've put in a lot of time and effort into trying to help him but it's felt very one-sided. Is there a tactful way to say this and end things in a place where he can't twist what I'm saying to make me look like a bad person?