Hi AW. I think that you should still be talking to MIL, if you have been talking to her all along. But you do need to stop talking to her about this. Its obvious that shes not comfortable with it, and continuing to try to get her to talk about it might push her away. If she asks how its going, be vague, tell her about the ball game that you went to, or your school plans. But stay away from things involving your H.
A few years ago, my sister had an affair. She got married just after she turned 18, and had their first baby on their 1 year wedding anniversary. She never has had her own bank acct, own apartment, she has had none of the sort of rights of passage that people go through as they grow up. And I think that it had a lot to do with her A. She literally had a crisis, not quite a mid life crisis, but she was suddenly unsure of everything. She behaved shamefully, but their marriage recovered and now 10 yrs and two kids later, they are fine. But, I really think that missing out on those things that you are supposed to do earlier in life can come back and haunt people.
The only good thing about these, is that they are temporary. Hopefully, he sees what hes giving up before its too late.
Now, what are you going to school for? Thats really exciting, and if you are open to it, you can have a chance to make some really good friends. Some of my closest friends are people that I have gotten to know through school.
I guess I gave the wrong finger to the wrong man...