How should I act when I know she wants to break up?

It could be that she is scared of commitment. Some girls are (its rare but it happens) 5 years is a long time. She might think "Is this the guy I want to spend forever with, or will the relationship continue as it is? " She might be shopping for guys because she's confused on how she feels. She could be looking at other guys and comparing herself to them. See what these two weeks are about. Don't shower her with lavish gifts, girls love to be held, to be taken to relaxing places and her restaurants with her favorite food. After two weeks, give her some space to think.

Well, go and see what happens. Sweep her off her feet. When you go back home, if it still feels like something's going on behind your back, ask her about it. Maybe it's time to move on. People change and there's always another out there. I know it takes time to get over someone, but you shouldn't limit yourself to only her if she's not doing the same for you. It's not fair, and you should respect yourself a little more than that. Even if you are 'addicted'.

If she says she doesn't think she loves you anymore, then she surely doesn't. If a girl or guy truly loves another, then he/she will have no doubt about it. The fact that she has doubts means that the love is gone. Don't waste your money on plane tickets right away.

If she said that she doesn't think she loves you anymore, then ask her why, or ask if it's another guy. If she says, "I think we should see other people," then take these words of Jeff Foxworthy: "If she's not riding him already then she has at least taken the saddle out of the barn. " If she says "I need space," the same thing applies, because that's total bullshit.

She had to build the courage to tell you that she doesn't think she loves you anymore. And it takes a lot of courage to do that. That probably means it's a lost cause. She probably has already let you go (and possibly replaced you). Let her go.

Dump her. Do it now, seriously. You'll thank me latter.