Went from loved GF of 6 yrs to side chick

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So I just had a conversation with my ex of now going to 4 years of being apart .

I dated this guy for 6 years and it was to the point where it was a bunch of promises. They were never fulfilled.

So now he tells me he's getting married and having a kid with a girl he's barley been with for 1 year . They moved out together , which was his promise to me as well .

But yet he has the audacity to ask me if I want to hook up !? And I'm just like confused cause the respect level went down quick .

I said no obviously, but it hurts so bad knowing the love of my life , the "man" who took my virginity would tell me to be his side hoe and not the one he's wanting to marry .