What would you do?A must read!?

I have 3 good friends,we are really close.Well I work 11p-7a,and I went to 7-11 last night to get some coffee and a roll,and I see one of my friends with the other friends man.Now the thing is my other friend had just called me and said her man was going out with the boys.Now after 7yrs it seems like the last 3mths been kinda on the brinks.My friend was like girl he just needed someone to talk to.So I did'nt say nothing but I told her you know you wrong.He said nothing,just stayed in the back by the beer until I left.I wanna tell Michelle that I saw Jasmine with Darryl,or do I mind my buisness?They looked like they was tore up (drunk).I just want to do the right thing.Any advice!