Cheating boyfriend of 12 years!

well, me and my future husband to be, so i thought! Been together for 12 years! We have three sons together been living together for 10 years! we've know each other and each others families since kindergarden! Im a stay at home mom! I do everything for my family including his! But they are users! They did everything to try amd break us apart! They are always in our business! I stop talking to his family, because they wiuld put negetive shit in his head! Fir a long time he was a spoiled Mama's Boy! Then he started to change! He was moody, mean, distant and eragant! Money was always a subject starter to our arrguments! I would ask for money, because i was always home with the kids! Now some bitch calls my phone saying they have a daughter together!I cussed the Bitch out and dumped his ass! Child support Mother Fucker!