What to do, what to do...

I know what to do. Going through the motions is easy. Really feeling the outcome of the decision is hard. What do you do when you see you family slowly falling apart? Not me and my hubby. My sibs, some of them anyway. I understand what prompted the split, but how far does one take it?

After a bad breakup a few years ago, a mutual friend of my ex & I, shunned me. He didn't know my side, however wrong I might have been, the reasoning wasn't one sided, I was not the only bad guy. But, he went with the 'bros before hos' mentality, even though he and I knew each other before my ex knew him, granted it was scant weeks before.
I know something of betrayal, however mild.
Not talking to the offender/betrayer, not confronting them, just deciding to be 'finished' is that enough for you? I know that I didn't try my hardest to clear up my situation. But it's years in the past. The offender/betrayer wouldn't even know what I was talking about should I bring it up. So there'd be no resolution. I've let it go. The hurt that was caused me at the time matters not. I've tied my life to another and he's never hurt me or betrayed me. That's all that matters.