How to get over being cheated on?

I don't know weather it's cheating or not. But anyway. My boyfriend went to a club for the first time with all of his single mates to celebrate someone's birthday. I was taking time away from my phone because i was in a really depressed state so i hadn't been talking to him for a few days. He went out and lost all of his friends so he walked up to a girl to talk to her for some reason just because he was on his own. Then when he went to say bye he went to kiss her on the lips and she turned her cheek.

I know this because when he went out on the saturday night i stopped at his on the sunday. Then on the monday i went on his phone to send silly snapchats on his story to make him laugh and then i pressed the middle button on his iphone twice and it came up with all his apps open. I saw on facebook he was talking to a girl called Chloe. Bare in mind his profile picture is with me and she's saying to him that she wants to meet him and he said "i was going to kiss you and you turned your cheek" Then he said he'll pick her up and they'll go out. They was texting at 4 in the morning and he was drunk.

when he came upstairs i told him what i saw and he told me the story. We cried and had alot to say then he tried to break it off and i just couldn't. We spent the rest of the day happy that it was all off our chest and i told him he needs to earn my trust back.

Today i'm still shocked and i don't know how to get over being cheated on. Any advice you could give me?

You have a choice either leave his ungrateful little… Or you're going to have to live with that I'm sorry I wish there was another way "/
And as always I wish you the best of luck

Understand that life isn't always how you expect it. It's not a fairy tale.
I think you should give your self a break.
Hang out with yo girlfriend's, a girly night? Go shopping, watch a movie etc.
Then get in touch with him again, talk to each other and sort things out. I know it's easier said than done but you gotta try, make sure he knows that he needs to earn that trust and if he doesn't then I apologise he isn't the one.

You'll never completely trust him again. Even if you think you do, that thought will always be in the back of your mind. You'll go through his phone, worry when he's running late, ect. And you can't have a good relationship without trust, so as hard as it is, you really need to move on and let him go. Drunk Is not an excuse.