Would you tell your best friend that you saw his/her lover dating someone else?

My suggestion is that you should make sure the relationship between your best friend's boyfriend and that girl. Maybe it was just a misunderstanding. After making sure they are really dating, you should go and talk to that girl first,after all she is also your best friends. You can ask her if she knew about this triangle problem and how she mean to deal with this.Then you can ask your best friend some questions about his boyfriend's strange behaviour and then tell her indirectly. Try your best to not to get her hurt more. But hiding from the truth is wrong. The sooner they know, the better. Believe me

I'd definitely do what I think is right. It's not right to cheat. And it's so not right not to tell someone what he/she is supposed to know. I'd definitely tell my best friend about what I saw for her to be warned. It's upto her whether she's gonna believe me or not. Well, I don't care if she doesn't! As long as I've done my part, that is being honest, I'm alright with that.

I think I have read discussions of similar, if not the same, events here in mylot. Anyway, I have also been in the same situation myself, wherein I saw my best-friend's girlfriend at the time dating(or supposedly on a date) with a different guy. I wanted to just make no big deal about it, thought of it as just a friendly date but when I did noticed the the guy's arm was around her that's when I said to myself, I'm totally letting my best-friend know about this. So I did, and at first he didn't want to believe me but then they broke up soon for whatever reason, I didn't care to find out, just relieved they did. The girl wasn't my friend so I guess it didn't really matter to me and they were just starting their relationship.

Hello Shennily! Your best friend must know that. My suggestion is you talk first to the guy, tell him that he better tell everything to his girlfriend and if he did not do that you are the one who will say it. In my view, if you will not tell it to your best friend your tolerating the wrong doing of his boyfriend which so happen your closest friend too. You saw him for a purpose and its not an accident. So I encourage you to stand on what is truth. God bless!

I am going to confront the GUY first, have to know the reason why she cheated my best friend. Have also to think, maybe they just friends, knowing the reality what's really going on.. then have to talk secretly about the other girl to confirm her relationship to you best friend's boyfriend. you need to investigate FIRST before you going to conclude, maybe you think is wrong, right???

ofcourse i will because i love my bestfriend..:))

if you are in your girl best friends shoes what will you do? do you want to know? do you want to know from someone else(not your bestfriend)? or to your best friend? but if i were you. i will tell her even it hurts. i know what is right and the right thing to do for me is to tell her. she deserves the truth.