I didn't get married until I was 42, I made it happily on my own all that time, and it was well worth the wait. You both have a lot of growing up to do still. Sounds like she's going through that stage we all go through when growing up gets to be too hard. You know, your parents never told you what it was really like to be grown up did they.
Lot's harder than you figured. But hang in there, I promise you better days, much better days. Like that new country song out by Brad Paisley, Letter to Me. You should listen to it, it's really good.