He loves me but is with her because of obligation. What should I do?

Anonymous
After losing trust in my husband since discovering he had an affair, our marriage disintegrated. I took comfort in a male colleague who became my confidante and support. I fell in love with him. He has a girlfriend, who he wasn't in love with, but maintains the relationship due to responsibility. Although it was against all my principles I was undoubtedly crazy in love with him, we had an affair. We had plans to be together after we end our existing relationship, however things didn't go to plan. When he told his girlfriend that he cheated on her, he thought she will leave him, but instead she wanted to remain with him as she still loves him. This surprised him, and his feelings of obligations towards her deepened. He felt he wronged her and owed her too much to leave her. Although he is in love with me and not in love with her he felt compelled to pay the price of his sinful ways, and to continue the relationship with his girlfriend. This resulted in him quitting his job and telling me that we can't see each other anymore. My heart broke, and my feelings of sadness is overwhelming. I know I deserve it and that I put myself in this situation but I really don't know how to go on without him. Please give me advice of:

1) Should I wait out their relationship to end (how long do you think this will be?)

2) Should I try to get him back (e.g. say I'm pregnant with his child so he'll feel obligated to be with me)

3) Should I respect his decision but find a way so that we can maintain contact as friends (e.g. convince him to return to the job and that I'll promise to keep my hands off him)

3) Move on and find a replacement (I don't know how to do this. I don't think I can. I don't want to be with anyone else)
He loves me but is with her because of obligation. What should I do?
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