Relationships

Do I have a right to be upset over him being with her?

I have a friend that is in a toxic relationship, a couple weeks ago he found out some stuff about her including so inappropriate talk she was having with another man, a man she has stayed at his house multiple times. He isn't convinced she actually had sex with this other guy but I am. I saw my friend the worst I have ever seen him, he literally had a mental breakdown to the point that I took time off work to help him so he wasn't alone. Well less then a week later and he's back hanging out with her and believes everything she tells him, how the talk was all just jokes and that she never actually acted on it. I'm mad that all the sudden things are good and he's acting like nothing ever happened, do I have a right to be mad?

Do I have a right to be upset over him being with her?
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