Is there anyone out there that's going through this or been through it that can give me some advice or just encouragement..😭

I'm 12 weeks pregnant. Long story short my boyfriend cheated on me & I just found out a couple weeks ago by happening to click his deleted pictures in his phone & seeing pictures of him & this woman kissing etc! He told me that was it nothing more had happened & I couldn't let it go so he finally confessed they had slept together but he didnt care about her & wasnt into it. Fast forward to now I gained access to his fb this morning & he doesn't know about it & seen him messaging this girl asking her what shes doing this weekend & searching for an ex he used to be with. He then deleted the message he sent to her but I had already seen it. So he is being super shady.

So basically I dont trust him. But my emotions are all over & I feel like I cant move on. Like I'm not strong enough. I dont want to go through this alone which I basically am anyway but the thought of leaving & I know he will be with someone else just makes me sick. How could he treat me this way while carrying his child. All I do is cry & just dont leave the house dont want to be around anyone period. This is supposed to be a happy time for me & I am miserable. How do I let go for good & what am I supposed to do in regards to him & the baby as far as their relationship