Has anyone ever had a relationship end because of someone else interfering, thus causing it to end?

Any advice on how to cope?


(In my case, she was flirting with him three days before the break-up.) And denies it all to me (the guy) at the breakup.) And I didn't know until the day after. also, they went out two days after, our breakup. and it seems like its going strong for two months. do you guys think it's going to end?Has anyone ever had a relationship end because of someone else interfering, thus causing it to end?
You never know with these things. But im sure if you move on she will probably be jealous.Has anyone ever had a relationship end because of someone else interfering, thus causing it to end?
Ya.. It may. Coz., she may get another guy and she can leave this guy na.,