I need to rant a bit

So my ex-husband and I have been divorced since November. We are dating other people and he has visited with our two sons. Or oldest son turned 3 today. My ex-husband celebrated his birthday yesterday when he had the boys. They had a joint birthday party between my son and his girlfriends 2 kids, ok whatever right. But he also proposed to her during the birthday party. He has only known her since October and has already asked her to marry him.

I guess I shouldn't be mad but it's that he proposed to her during our sons birthday party. He couldn't even have his thunder for one day.

Ok, rant over. Feel free to comment if you'd like