Child and Partner Breakup Question

So my son and his girlfriend, the girlfriend's sister (also a friend of ours) and the girlfriend's dog lived in a family rent house. The girlfriend and her sister paid rent and kept the home in excellent condition. They also paid the utilities and had my son reimburse them. He did not pay rent but says that he would be willing to pay rent per request. Our son has struggled with OCD and depression and anxiety and as a result was not working this past year. The girlfriend has been with him through some rough times - almost three years. The girlfriend recently broke up with him and before doing so offered to move or pay more rent and we told her that the home was hers and her sisters since they are the ones we had a rental agreement with and the ones with all the furniture and the ones paying the rent. Their parents live in another city. Our son had a computer and some clothes and we live down the street. Also, her family was in the midst of an emergency causing she and her sister great stress. Under all of the circumstances we agreed to allow her and her sister and her dog to stay in the home. She asked our son to move out and we supported her in that decision and also asked him to leave the home. We have offered our son his room in our home (for free) and we have also offered to help him with an apartment with a roommate and have offered to help him with graduate school. Is this a great situation? Of course not. Did we think they were getting married? Yes. But it is what it is and life is lumpy sometimes. Still, our son now says that we are no longer his parents; we have betrayed him; we took "her" side; that we are liars and well we are just as he says "shit parents." My son says that "there are lines you should not cross." And that for the sake of moving on and forgetting, we should have politely given them x amount of days to move out. Hey, it's not a great situation but I think that we all took the high road and that our son is overreacting. So, are we the worst parents in the world?​​ via /r/Parenting http://bit.ly/2Q6cwfk