I’ve known this guy for 4 years, he’s my best friend to date. About 2 months ago he started dating this girl and he likes her very much. However, there’s a rumor saying that the lady is messing around with other guys, and I don’t know how true it is. I heard this from other friends who are closer to the lady but I’m not 100% convinced. AITA for refraining this Information from my friend?