Sweetheart, i am so sorry you have to deal with this. Its not right at all. if he is deleting messages he probably has stuff he's trying to hide, though. My ex did the same thing and he kept on seeing another girl.
Ouch! All i have to say is do you want YOUR daughter to date a man that does that to her because that is the kind of role model she is unfortunately getting now :-( hard to say and hard to act on it but id pack his stuff and hopefully you have family to help you!
I'm sorry that you have to go through this, especially now being so close to your due date.. You don't deserve to go through this at this time.. I hope you make a smart decision for your own good and your baby's too... I would definitely not forgive if I were you.. I'd go to family and friends for support. You don't need a man like that in your life.. I wish you the best sweetie! Keep your head up, you're worth a lot more than the way he's treating you! Respect yourself and love yourself first..
So sorry to hear this! Right now your #1 priority is to keep your baby safe. That means stop looking through his phone, it will only keep you upset and the baby can feel that stress.
Have you put your foot down and told him this behavior is unacceptable? Actions speak louder than words, so show him you are serious. Go stay with family or friends.
Best of luck!
Make your child number one and don't be with him right now, you deserve better. Your going to be a mother and that is beautiful and empowering.