what will you do if the FLINGS of your LOVER is your BESTFRIEND?

Since both people betrayed me I would have to end both relationships.If they could that to me then what else might they do or have already done.

This is really hard to take.. :( I do hope this won't happen to me, I would probably get things done the right way.. But I would ask what I did wrong, why he did it, and all of people why with my bestfriend.. I need to know those things to be able to understand the situation so that I can get over it, I know things between us will be over then because he cheated on me. If he loves me that much then there won't be any single thing in his mind that would made him cheat on me..

If that happened, both relationships would be over. If my lover and my best friend were together, that would show that neither one would care about me, so why should I care about them? Let them keep eachother!! If they are going to act like that, they deserve eachother.