Should I just end it for his sake?

So my boyfriend and I have been together for 2 years. Before him, I was with a guy that cheated constantly and now I have severe trust issues. When we first started dating, I trusted him. Then my trust issues started kicking in when he did a few things. He never cheated or anything, he just liked his ex's revealing posts and noticed her a lot. I mentioned it and he unadded her on everything and said he never meant anything of it and it was just posts he would come across.

I decided to go past it since he realized immediately that it wasn't okay, and I know he definitely didn't have any feelings for her because she was extremely toxic and he had the worst time of his life with her. But the damage was already done and my trust issues slowly started coming back just for that little thing. Now they are just so bad, and he knows they're bad and he got annoyed with it once, but he still wants to be with me. He wants to marry me in the future and so do I, but I know my trust issues are getting in the way.

They are so bad I check his snap score and see that his goes up so much and wonder if he's talking to a girl. I see if he likes any revealing pictures of girls on insta, and there are a few, but he follows 1,000 girls and a lot of them have private accounts. I know this is psycho, I really do, It's so bad that I'm getting a therapist to help me through my issues.

He told me that if my therapist can't help my issues, he'll help me through it. I just can't stand this anymore, the constant worrying and everything. He's in the air force now, just recently joined, and it makes it worse because I can't see him. I want to be with him, and he wants to be with me, but I just cant help but think I shouldn't be in a relationship right now. I'm already in this committed relationship though and it'll break his heart if I ended it. It'll break mine too, but I don't know if it's the best option while I get help with therapy. Or should I just stay with him through the therapy? I'm not sure how long it'll take for my insurance to cover a therapist though.