I know it's hard... Same atmospher run the house with our divorcing parents. I hope she will come back to you. The distance between my (older) boyfriend and I whilst I'm at university could be easily taken as a 'break' by some... I hope it is simply a need to be physically distant and not emotionally distant or an excuse to sleep with other people. Whilst we're apart I am doing my own thing, having to organise my time alone so I understand there may be things she needs to sort out alone, perhaps she should go back to school in the meantime. I may have to move away from the capital city, all I know, family and friends, but I tell myself if I love him I will do it. It is scary, I'm young, too and still living with my parents, scared of moving far away from the familiar and I am 3 years older than your wife... God only knows how she feels. Do you think he felt a little 'pressured' to marry you? Not that there's anything wrong with you, you seem perfectly reasonable, she might just be freaking out.
She could either be young, mentally mature and committed to the relationship but just needs time to sort her own shit out (liked and my 3 years of college)
Or she just saw you as available and (aforementioned) a provider of things girls her age may want (a man who can drive, has money, will take care of her but isnt /quite/ old enough to be her dad) as is the case with most girls that age dating a man a good few years older. It is not always the case but very often is.
God I hate it when a woman screws Up one of the few good guys left on this earth. If she really has screwed you over and isn't coming back I hope it was simply because she freaked out and not out of spite, though I hope she doesn't ultimately screw you over at all.
It's also sad that people have to say leave young girls alone because the immature ones pull stunts like this or aren't serious. Just as you may say you need a WOMAN there are young women out there that need to date a MAN like you if you give them a chance before the BOYS turn them into the damage goods you're having to deal with. Looks like a few teenage boys ruined her already or she never really cared for you..
I'm glad there are guys like you that will still give a younger girl a chance.. Not all of them are like that. I've been ready to settle since 16... Just so sad you got burned...
I pray she either comes back with her shit together and apologies or you find THE ONE that will make all this a distant memory, hun x