Should I still be with my boyfriend after he moved on with another man ?

[Biki1992]

Hi , I am 25 years old and my bf is 52years old. We have been in relationship (online) for more than 1years. He is in USA and I am in India . We have been planning to get married and live together. After few month of relationship he got another man from same city. He started taking more care of him. But he never giving upon me. Two weeks ago he moved in with him. He told me he want to make relationship with him. But he also doesn't want I walk away from him. He has been cheated by him many times. He told me his boyfriend always told him that he doesn't love him.Still he is trying to make relationship with him because of I am very far from him. he is gonna make relationship with him and always saying to me not to give upon him. I don't understand why he like me to be with me. Is he trying to make me feel hurt or want to torure me . I love him so much. I always got jealous of seeing his post on Facebook about his boyfriend and mad on him that make him very upset and doesn't let him sleep whole night. Now I am in dilemma that whether I should stay with him or not. Being with me he never gonna get happiness. That's why I have been thinking of stay away from him and let him go on in his way. Will it right dicision ?

Could anyone help me ?