Poor Xer07, he needs some guidance.
1) Having a flighty relationship (or relationships) with others over short amounts of time seriously damages the quality of a genuine relationship once the real person for you has been found.
Solution: try to avoid socially awkward positions such as three girlfriends at once. In extreme circumstances, just make friends, not girlfriends.
2) I am sure that we are all sorry about Mishayla, but pressing the issue will probably not help. Thinking back about what has happened will POISON your future relationships. She's gone, she probably won't come back, getting depressed about it only changes YOUR attitude, not what has happened.
Solution: meet new girls and learn more about them. Simple. If you are moving away, then you will most likely have an excellent chance to meet plenty more people.
3) You are helping her with relationship problems? Are you seriously helping? My impression is that you need more help than she does, she might just feel a residual need to talk to you, and you likewise.
Solution: Stop. If she is causing you pain through things like this, just stop. You might be causing her pain as well, and as I stated earlier, continuing past the separation point will poison all future relationships.