Guy's Behavior

Guys, Is it normal for a guy to rain check for his best friend that is going through a rough patch with their girl?

I have no issue with him hanging out w/ his best friend, but b/c of his past I do have to be cautious the least bit for myself. I’ve never met his best friend until recently this year, but seen/heard about him 2 years ago, so I don't know how they are together, like if he cheats on his girl & my man tags along. Extra info: rekindling with my ex after yearsssss, was terrible to me in the past, but admitted it to me & apologized, he wants to focus on me & pursue a relationship the right way again. Has been consistent for the most part, but he just seems to hang out w/ him (his best friend) more -activity wise- than me. I feel like I’m more jealous of their relationship more than anything. by the way they live together as roomates.

Guys, Is it normal for a guy to rain check for his best friend that is going through a rough patch with their girl?
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