This is not the first time Carly has told Bo she would leave if that's what he wanted. Actually, all through their relationship this go 'round, she has been the one to show hesitancy and offer him "outs". She's given that man every "out" under the sun, and he never takes her up on it. It is Bo that has been made pretty much every move, insisting that she live with him, never backing down that he loves her and wants her with him. He's told practically everyone that he loves Carly, even as their relationship has been met with nothing but ridicule and unacceptance. A while back, Carly told Bo that she would rather be hurt than live a lie, and they should end it right then and there if he felt they were a mistake. He said no, he doesn't regret anything (although both admitted to perhaps going into this a bit too fast), blah blah. So, if Bo wants back with Hope, he's certainly not being held back by Carly.
I think Carly just sincerely loves Bo, she always has. She wants what is best for him, even if that isn't her. That's real love right there. And unlike a certain someone, she doesn't play games with him, guilt him, discount his feelings and blame him for everything that goes wrong in HER life. Carly is being written very maturely; with compassion and patience. She's actually being too saintly, if you ask me. She should shake Bo out of his enabling of Hope, tell him he's not to blame for her trying to murder him. Ridiculous!!!!
The Bo and Carly relationship is much more deep and affecting, IMO .... despite, of course, the show giving them one episode a month together solely to prop up the plight of Hope Brady. Carly loves him enough to let him go if that's what he wants. So far, while obviously concerned about Hope, and guilt driving his emotions regarding her, he hasn't been willing to let Carly go. According to CC's tweets about scenes she's filming with Peter, at least two months from now, they are still together and sharing kissing scenes. So, I wonder how they are going to end them to put Bo back in the thankless role of Mr. Hope Brady.