Lost and Hurt

Been with a man for 8 years he’s cheated almost 7 of those almost had 3 kids on me. He has had a family member living with us almost the entire relationship. I’m tired and mentally drained he knows this. I lost my mom in December I’m alone despite having sisters then trying to help my kids cope with the pain and trauma of losing their grandmother. We have no support and I finally told my boyfriend ur was time for his family to leave and for that he dumped me I feel used and even more stupid. I can barely function and don’t know what to do anymore.