Past cheating in new relationships

Okay so here’s the situation and I know some will say I’m overreacting and negative shit but let me start off by saying I don’t treat my boyfriend any type of way or look for problems within our relationship so I can jump on this site.. I’m honestly just looking for an outside perspective.

I’ve been cheated on many times, i know that doesn’t mean he automatically will too but I do have some experience in the signs. For 11 months we’ve had a pretty good relationship. He’s got some insecurities but I’ve let him know I’m not about to cheat on him, I would never do that to someone because it’s just a shitty thing to do. My daughters father cheated on me with anything he could stick his penis in, it really ruined my self esteem. anywho, he knows my password to my phone. He’s been on it but he didn’t look through my stuff... just watching fb videos or we good stuff together. I don’t have his password and that doesn’t bug me, I don’t need to know it... it’s his phone. I noticed this past weekend he had his brightness turned down so I couldn’t see his screen, I summed it up to his phone being dead or headache from looking at his phone . Whatever right, I then noticed he was placing it face down, and he was just acting strange. He’s always left it in the room when he’s gone to the bathroom or just doing stuff but now it’s stuck to his hip. We talked up this morning for work, he made sure the brightness was dim wouldn’t check notifications or whatever until I left the room or he did... his phone was going off late at night and it never does! All weekend he was getting notifications like rolling in quick... all day and night. Something just feels off with him, he’s quiet with me... didn’t want to have sex, wanted to go to bed at like 7pm, hiding his phone. idk ladies, am I crazy or what? I don’t want to be the girl that brings stuff from a previous shitty relationship into a new one but I can’t help but have this gut feeling.