Need some advice ..

Okay so recently my man stopped posting me on social media just randomly and said he doesn’t want people getting involved (when he posted me nobody got involved) and then he started acting strange with his phone wouldnt let me on it anymore and changed his password... so I was convinced he was cheating, well he left it unlocked by accident so I grabbed it and opened the app ‘ snapchat’ and had seen he had been messaging a few girls including his ex being on his best friend list no messages was saved but I thought okay my gut feeling was right and I politely asked him to leave I ended it with him however his claiming he did nothing wrong... I just cant trust him and a girl I asked him not to talk to as he was always texting her in a flirty way was also a recent snapchat. I’m 8 weeks pregnant and it’s so hard he is trying to tell me I’m just being hormonal .. what do you guys think?