How do I treat someone who’s betrayed me?

My boyfriend of 4 years betrayed me. He lives abroad now, and dated a girl for two weeks, she ignored his text, and he was actually upset about it.

she's 18. He’s 34. I’m 24.

Wtf? I know it’s easy to say, cut him off, etc, but it’s been 4 years. We just ended a horrible 2-3 day trip and I just found out yesterday. I’m at the airport now.

i sent him angry texts, bc I couldn’t control it. What do I do? Block him? I’m just not sure how to deal with this as it’s fresh, and I’m just so shocked and hurt
1 y
When I first found out, I was angry and wouldn’t talk to him for hours, bc I thought it was just during the break we had.

Then he told me it was recent, just couple months ago when he came back to town. Then, I cried, and cried, all night. I didn’t get any sleep. He was up trying to comfort me, but I just couldn’t stand him.
How do I treat someone who’s betrayed me?
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