<human>: Can you give me a shortened version of the text?

They broke up about 4 weeks ago and he is still trying to get back with her even though she already has someone else, she has basically been with this guy ever since they broke up. Its likely she was cheating on my brother with this new guy, because she cheated on him last year, broke up, with him dated the new guy and ran back to my brother when it didn't work. 

Every time he goes through a break up with her goes out drinks, gets depressed, and then texts/calls her saying either mean or desperate things. Some time he went over to her place and tried to fight the new guy but came to him senses and left before he really hit him or anything. Last night he went over to her place under the ruse of getting his stuff but confronted her about FB messages between her and this new guy, my brother had her FB still logged in on his computer this whole time so he saw everything they said to each other on FB.

I understand why she is upset with his behavior. I don't understand why he wants her back after basically cheating on him twice and lying about it for weeks both times. They have only been together about a year and 6 months. Anyway I don't know if I should tell him what she says and risk upsetting him more or if there is another way to approach this.
<bot>: brothers ex texted me that he is being annoying and is wandering if I can do anything to get him to stop bugging her.*