Abandoned

I was in a verbally abusive marriage for 6 years with two young kids - he  took my money because he spent all his money on his car hobby, never helped me,nor hung out with my friends ...then I met Tony. Tony was sweet, financially Savvy, and made me feel safe. I fell in love but he wanted a child to have a blood sibling for his son. I was more focused on the well being of 2 young children to save them from the verbal abuse they’ve seen from their dad.....but they loved their dad very much. My parents could see my loneliness and depression being stuck in a loveless marriage and suggested I get out. But I was fearful for the kids being sad. I ended up staying with their dad, told him that I met another man who was going to live with me and proposed to me. He was hurt but understood why I did it. He’s trying to be better so I stay with him. And I love the kids father as family but love how the other guy made me feel. I did what was “right” and stayed with the kids dad but felt I needed closure with Tony. So I went over to his house, to find him with another woman. I am crushed but Tony told me to move on because this other woman will give him the child he wanted. Why do I feel like I was betrayed and alone?