When is Enough...ENOUGH?

Was having dinner w/  friends and one of the usual topics came up: boyfriends and them screwing up ALL the time. LOL. It made me wonder:
When you're single, it's easy to walk away once your love interest isn't acting right (Ok, its not always that easy. LOL ;-))  but what about those in long term relationships? When do you throw in the towel and call it quits? When iContinue to talk to a dude that iM really into that has done wrong, Im considered stupid. When a friend's boyfriend acts up and the relationship continues, its alright because "they're trying to grow together and build" n blah, blah, blah. From the outside looking in, things seem to be going downhill fast. They're always arguing and never satisfied. Don't get me wrong, there are good days...but lots of bad ones too.

iCan't help but wonder:

 Is this really love? Is this what iHave to look forward to one day?

Ok, ok...iKnow everyday won't be perfect and occasional arguments are healthy, but...constant battling?...Like...EVERYday? #comeonson That can't be what love is. And iAlso understand when you're in love with someone it's hard to just walk away after spending so much time together. You get comfortable after a while BUT at what point do we not realize that the person we once fell for isn't who we're currently with? Hmmm...Maybe what keeps people holding on in failing relationships is their hope for that old lover to return..but at some point we have to be real with ourselves. More than likely who you met is long gone. As Kelly Rowland once said, "when you first meet someone, You're meeting their representative." You can either realize that you two grew up and grew apart OR...continue to hold on to what's left. Again, my question is: When is enough..enough?