I don't typically do this but I could use some advice.

My oldest boy is 26. At that age (again no offense) young dumb and full of ....
Someone should pay (imo) so if he forgives her, he should be punching out her bootycalls. That may spark something to straighten the situation out.
No kids involved. Both of them are 26. He is in a big hurry to settle down and have a family so he thinks she is the one. I can't speak much about her maturity because she didn't want to spend much time with us.