Yes, take at least 6 months of no dating/personals/eyeballing hot chicks whatsoever. Yes, 6. You will think you have it after about 2 weeks, then you will fall back in. Then you will fix the mistakes you made and get it the next week, then fall again. It is a complete metamorphasis of yourself that needs to occur before you can start a new healthy relationship. Certainly after a long term one as what just happened.

Tell this online girl the truth; that you were maybe lonely and confused and scared, and tell her you need time alone. If she is the right person, she will wait, if not, then the hell with her. CERTAINLY DO NOT continue any relationship with her. You are not whole at this point and will not be for half a year (ish) PLEASE DO NOT PUT HER THROUGH THIS IT IS THE WORST THING YOU CAN DO TO SOMEONE!!!!!! By thinking you're ok and being tough guy "bah, 4 year relationship is nothing, I can handle myself" you are not only setting yourself up to be screwed, you are also dooming whoever you rebound with; she has done nothing to deserve a relationship with you that failed before it started. It takes time. A whoooooool lotta time, and it does suck, but you need to fully clear your mind and heart before entering a new relationship. Please don't string any new girls along.