<human>: We are in college and he is in a fraternity. I hung out there long before we met and started dating (we dated for the last ~6 months, broke up three weeks ago), and I basically always hang out there. I have been there multiple times since we broke up without any issues. I know everyone really well, and to my knowledge they all like me a lot. 

I have an upcoming event where I need a date, and I want to invite one of his fraternity brothers, but I don't know if I am overstepping my boundaries. We are still friends and he has no feelings left for me. 

Mostly I just want to have a fun night with a friend I actually care about (I will be paying for my date to the event), especially since my female friends that will be there are also all friends with his fraternity brothers. Is it awkward of me to invite one?

Summarize the given text in a few sentences.
<bot>: Ex broke up with me, still on good terms. We have the same friends but they are his fraternity brothers. Want to invite one to an event that I am paying for. Is it too rude of me?