Confused about who I am to him 😕

Okay so where do I even start! This is going to be long , so bare with me please but I need help.

So I’ve been seeing this guy, we get along, I really like him, we’ve seen each other a few times , he’s come round to my house and we’ve had sex. Anyway I asked him numerous times if he is seeing anyone else and he said no to me, I told him so many times not to lie to me and to always be honest with me, Anyway one night whilst he was at my house , we had sex , he went to the bathroom, and he had left his phone on the bed unlocked! What do I do!! I obviously couldn’t resist the urge so I pick up his phone , I know I shouldn’t have, but I did. And I go through it and I see all these girls numbers, anyway I’m fuming, he comes back in the room and I put the phone in his face, I’m going crazy at this point. Anyway I leave the room, I’m expecting that when I come out the room, he will be gone , but I come back in and his sat on the sofa with his head down, he looked so broken , so he goes on to explaining how sorry he was and he didn’t want to tell me as he thought he’d lose me and he started to like me and I’m nothing like these other girls , they know it’s no strings attached , but with me , he feels different and he wants to take it slow, he explained that he has insecurities when it comes to a relationship, and his ex lied to him for a year that her child was his , he bought the child up as his own , so after that he finds it hard to connect with a girl on an emotional level , but he feels so drawn to me and that it’s confusing and when tries to pull away he comes back to me, he stayed in my house all night till 3.30am to explain and reassure me.

Anyway guys I really like him, but since then I’ve just been feeling so upset about it all, I want to be with him , but I feel so paranoid all the time . Whenever I question him , he’ll always reply back to reassure me but I’m scared I’m gonna push him away and put him off with my paranoia 😩 What do I do? What do I say to him? I’m so confused😭😭 Male input would be good too!! Thanks