Help needing some advice about my Boyfriend's mother....

My boyfriend and I have need dating for 3 years I have a good relationship with his mother my problem is she started talking about my bfs ex ALOT how she graduated from college has a great job now which is wonderful for her but I don't care my BF doesn't care I'm friends with her on FB and see her comment on his exs pictures and comments I just seen on my feed that she even said you and mike would have had beautiful babies mike is my bf I don't understand why she said that on there does this mean she wants them to be together or what the hell? I've been with her son for 3 years. I'm i reading in to it too much? Do I have a right to be mad? Help?