Thank you for your question. That was a very fast decision for him to decide to get married.
I would stay in contact with him still because you just never know he might change his mind and realize he can not let you go.
You wan to tell him how you feel about him because that is very important for him to know that you do not want this to end.
You could say that you are happy for him, but you want to be the one to be with him.
You both have been together a long time and I feel like he needs to know that you both could work things out.
You have broken up 3 months ago but that does not mean you can not rekindle this relationship again.
It sounds like the relationship he is in is being rushed and he need to really think about what he wants.
I want you to ask him how he feels about you.
You need to show him that this relationship is not over and that you want to be in his life.
Ask him what he wants and needs out of your relationship.
Let him express how he feels about you and him, maybe he wants to get married too you.
I think you both need to really sit down and talk about your relationship because I think all the things he is doing is because he is looking for more in your relationship.
That was too fast to meet someone and decide to get married. It is like he is looking for more of a commitment in life. I am sure he wanted to spend hid life with you before anyone, but he seems to be rushing into something I feel he might not want.
You need to tell him where you see yours and his relationship going. Express your feelings let him know where the future is going to bring you and him.
Thank you again for your question.