Depression and pain from relationships

I do not no if I am doing the right thing by being on here but I came here For help I am a 24-year-old woman with two kids that I love very much my daughters father and I am are no longer together I gave this man all of me whenever he needed anything from me I was right there for him no matter what I gave him my heart my money and anything else he asked for we got pregnant 3months after being together and we now have a bueatiful baby girl who he lies to everyone about telling people that she is his grand daughter he left the state just so that he can run away from his responsibilities I continue to ask myself how a 67 year old boy  can act the way that he dose I am completely empty numb and full of sadness not because he left but because he chooses to hate and talk bad about our baby how can a jahova witness man do this