I feel sad

This guy that I’m cool with for 5 years said after we graduate high school we would have a baby and we’ve been planning it over a year now long story short he has a baby mama and now his girlfriend is 2 months pregnant and I feel hurt bc he has 2 baby mamas and I wanted to be his first and now all of a sudden he has 2 baby mamas and yesterday he sent me a pick of his daughter and it made me feel some type of way and it’s like every time I keep my myself busy so I won’t think about it but I can’t stop thinking about it I really need the best advice possible I don’t wanna be sad anymore crying about it how can I get over him and the fact that he has 2 baby mamas?