Complicated relationship He is not ready to leave his sl*t?

Anonymous
so when this guy met me, he was lost, confused and insecure. If at first I was not understanding why he was interested in me but at the same time mentioning another, later i understood that he was not over his ex yet. so the thing is his ex is an open relationship type of girl. She broke up with him because he is possessive and monogamous man. They chose to stay friends. When he met me the ex had a boyfriend. I took care of him and was helping him move on. Months later when the ex broke up she started giving him attention and he readily went. Recently his parents found out about me and they approve our 'relationship' because our families know each other but he isn't ready to leave his ex who lives miles away in another country and sleeps with all tsorts of men. She does not even value him, she doesn't even have a single picture of him on her IG (all other men). They are no longer together since 4 years. What can I about all this?
Updates
+1 y
Note: all his friends and families know about me. He never mention his ex since they are no longer together but he is secretly trying to get her back.
Complicated relationship He is not ready to leave his sl*t?
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