It sounds, by your thread, that the two of you were a couple for maybe 3-months or a little more! And moved in together after a month or more!
There seem to be a lot of problems and arguments for such a short term relationship! For most ... this would be a bad sign ... for a future together!
Now ..... when you were gone for 4-days, she saw her X! Now that she's gone with perhaps 2000-miles separating you both, what do you think is going to happen? And why did she move? Could she not get help for herself on the West coast?
Using the term "if it was meant to be" ..... just puts you on hold - and a one-way hold at that! And you could be on hold for years. I was in a 7-year on/off relationship. And finally, I got tired of her cheating ... and either ignoring our times off together or wondering all the time!@!! It ain't no fun - either one!
You have some decisions to make for yourself and that is "meant to be"!
Good luck - chose wisely!
Rob & Gizmo