Feel like I’ll be alone forever

Two weeks ago I found out my boyfriend and father of my 3 month old has been cheating on me during our ENTIRE 5 year relationship. I left him and holy shit.... I’m miserable. I know leaving him was the right thing but I feel so LONELY. Our son is my whole world and I literally love him to pieces but I feel like no one is going to want to be with me now. Of course I’m not going to rush into a relationship AT ALL. But I can’t imagine anyone wanting to be with me. I’m not the best at expressing my feelings but I hope you guys understand what I mean. 😔