Breakdowns can sometimes take a long while to get over.....when the mind is pushed to that point, it took a while to get there, it's going to take a while to get out of it also.

Take a break for awhile......

But seriously......don't base the worth of your life on some stupid GF who cheats on you.

Sounds like you need to get your value system together before doing anything else with your life.....get your priorities & goals that you want to aim for......not goals of having someone else tied to your life....but your life, your goals, your values & then when you get your self together, then you can add someone else to the picture