Need help letting go😔

Just had a baby with my HS sweetheart after 10 years. Our first child after a miscarriage a year prior. Found out he was cheating before, DURING, and after the pregnancy. Never could imagine this being my story. Kicked him out a month ago, no he’s staying with his parents, but he seems content with it all. Im baffled, beyond hurt and confused. Now alone in a home that once was ours with an infant. Smh...

Of course I know letting go is my only option. But its hard. Im even posting anonymously because Im embarrassed! But I need all the positivity I can get right now. Thanks in advance.