exhausted

Currently separated but living under same roof. Been wroth husband for 9 yrs. 3 yrs ago I filed for his green card. He was asked to leave country for the processing. He came back after more then 2 yrs being gone. Back for 2 months now, I found out he had an affair with younger girl.Which they established a relationship that was no secret to anyone around them. He come back tells me he doesnt love me anymore. He continues that long distance relationship with this girl. I have decided to move on with my life. I go about my day like he is not around. Recently he knocked on my door asking why I didn't speak to him or why to I ignore him. Then he starts crying. Saying not easy for him to see the person he once loved ignore him nor knowledge him. When hes angry and upset when he tells me he doesn't love me. Regret marrying me. He wants me to start dating and to bring that person to house not keep him away cuz he is in same house. When am out at nights he waits up till I get home then goes to bed. He offers his help if I need it but I don't want it. When I speak of him leaving or tell him to leave he crys or lowers his head. This woman is nothing good for him and I don't say that because am the ex wife. I say it because I see it. My friends and family say to let go. He made his decision and it not me. My brain agrees but my heart doesn't, gut feeling tell him this is phase, a challenge we both have to face. But I see no end to him speaking to her. Thou I know most their conversation end and start with just sexual stuff. I believe she offered the emotional and psychical support I couldn't when he was away. So he grown attached to it. But a man that can't look me in eyes and tell me that everything truly over between us. I don't know what to think.