There are not many options available really other than moving on. I feel for you, you must be crushed especially as it out of the blue, not exactly something you expect from somebody you have been dating for a year, I guess you have many unanswered questions and are searching for all the clues.
Not entirely sure if her ex would randomly propose to her after such a long time apart without any contact, I don't know, maybe it is like one of them chick flicks where like the childhood sweetheart emerges after four years with a ring in tow, maybe she is actually telling the truth but sounds a bit suspect to moi. I know it sucks at the moment but believe things happen for a reason, rise above it and accept that she is entitled to make her own decisions, and if her heart lies elsewhere then wish her well and goodbye. I mean why the hell does she assume you would want to stay in touch and that it would be okay for her to send pics of her future kids?! What's the deal with that? How insenstive can a girl get?! You don't need somebody like that in your life, remove her, wipe the slate clean.
[SIGPIC][/SIGPIC]
Love is like a merry-go-round: you get all dizzy, and then you feel sick!