<human>: So I used to be good friends with this guy, but near the end of 2014 I broke up with my ex, and learned she was going to see him the very next day and try to hook up, I wasn't sure if he was gonna do it but she said he wanted to.

I got pissed at both of them and stopped talking to my friend, after a long grieving time I realized I shouldn't have gotten pissed at my friend as my ex was the one at fault for both ruining the relationship we had, and she was the one trying to hook up with him.

How do I begin this friendship anew?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Stopped talking to friend after I learned my ex and him seemed to want to hook up the day after the break-up. Got pissed at both and stopped talking, how to build back the friendship?