As hard as it is to fall out of love, i have found it to be just as hard to watch your first love falling in love all over again, with someone else.
You could be friends with him, you could have moved on yourself, but to see the guy that you once pictured your life with, living his life with someone else tends to be a difficult concept to accept.
The person that they said would never change has changed for someone else. The love that the two of you once had doesn’t compare to theirs.
But he’s happy. She makes him happy. And that’s all you ever really wanted, was to see him happy.