Parents of Teenagers

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Hello,
I need some advice here. I have a 18 year old that started dating a 16 year old only a few months ago. At first we had a descent relationship with with significant other but after time went on red flags have come up. We have found out thru some mutual friends of theirs that she has a way of manipulating him into thinking everything is his fault, guilt him into giving his debit card to make big purchases, scratches him enough to leave marks, punches him arm just to see his muscle spasm, embarrasses him in front of his friends, and has said to me that every moment that they are working or at school they need to be together. He has even put off going to college because she wants him to stay in town and he has lost some friends due to the relationship. They got into this nasty habit of wanting to stay over night at each other's houses (he still lives with me) all the time. Being he is 18 and she is only 16 I told them that sleepovers were not necessary and they need to go home and sleep in their own beds. She gave me a piece of her mind and since then has not spoken to me and is telling my son that I am just trying to keep them apart and ruin their lives. I am at a loss here and don't know what to do. Does anyone have any advice?