Hi JasmineC, thanks for posting your comment.
I'm sorry for how you feel and for what's happened, but there are a couple of issues if I can mention them, the first is that his mother doesn't approve of your relationship, although this maybe a while ago and wonder how she feels today.
The worry is, how can you build trust with him again after he has posted these comments on facebook, so is it possible, maybe, but it does take a lot of work, however, it's not you that has to do this but your husband, because not only is he making these gestures but not being honest with you.
Sometimes love isn't strong enough to keep two people together, this is the second time (?) he has done this behind your back, and to rebuild trust after he has cheated on you is
to build the future, rather than living in or worrying about the past, this will just bog you down in questions which may not be answered, but I do suggest counselling together as well by yourself.
Please take care.