<human>: Can you provide a brief rundown of the text in within 3 sentences?

I've (26 M) been dating my bf (22 M) for five months and I'm constantly bothered by one his best friends (24 M). Before we were dating, he told me he slept with his best friend in the past. He recently revealed it was actually twice a few months before we started dating. It's so uncomfortable being around his friend now.

However, this is not the only reason why I don't like this friend. He parties non-stop and he does a lot of cocaine and ecstasy (my bf told me would send SnapChats of himself snorting coke). Of course, this is his life and I'm not gonna preach to him. He has been friends with my bf for awhile and I don't want to be a controlling jerk and tell my bf who he can and cannot hang out with, but it upsets me that he hangs out with such a low-life. I'm afraid he's gonna be a bad influence on my bf. Recently, my bf let this friend sleep in his room along with the friend's bf and his friend attempted to give his bf a blowjob while drunk while my BF WAS STILL IN THE ROOM!! I was really angry and I told my bf how I felt. He said he understood but sympathetic.

They don't hangout often but they do text/SnapChat a lot. I'm guessing I'm just unsure as to who my bf really is.
<bot>: Am I overreacting to my bf being friend's with someone who he slept with and who I feel is a bad influence?