How to get over my baby daddy!!!

His constantly telling me he loves me but he only wants sex with me really. He goes out every weekend and shags girls in club bathrooms. How to get over him and move on. I want to be happy again! I’m lonely and I just sit home when my son is in bed knowing his just getting on another girl. It hurts like trash as we’re together for 5 years and only broke up a year ago or so