Trust after lies

Princess

So I don’t think my boyfriend has ever cheated on me. But I know he was always talking &sliding into girls comments &messages. Including his ex. Which we have fought over before. Though it’s been a few months &I believe he has stopped. I’m allowed access to his phone whenever I want. With permission &without. Though I’m not always on it. I do look every once in a blue moon. I just have no trust no more. &I wanted to break up last year I even moved back in with my parents… fast forward about 6months to today were coming up on our 2year anniversary. I just feel like I don’t have trust even though I don’t suspect him of anything I do think he’s changed to keep me. Knowing I’m not with the shits &he doesn’t want to lose me. I just am not sure how to move forward. We have an apartment a dog &just recently had a miscarriage (worst thing of my life). I love him &would love to stay with him. But I’m just not sure how to get away from the constant doubt. Any help? I guess I’m just really scared of getting hurt.