"She is really just a pathetic girl with tons of issues."
Trusting, that is what I saw w/the OW in my situation. As soon as X had a real problem, she disappeared.
As far as the pressure to get married....the thing is, they are past the most idyllic and giddy part of romance. He probably won't marry her at this point. If he does, well, then maybe she is his "soul mate" or whatever drippy sentiment you assign to it. And unfortunately, that may be what he has become. You have to accept that this chick is part of his life now, for whatever reason.
M: 16 years Bomb 4/07 OW 20s long gone Divorced 11/09 I remarried New Guy Cooperative r w/X regarding D