AITA for kicking my son out because of his girlfriend?

I have just one son who is currently 20. His dad died when he was 10. I have been raising him on my own for the last decade, and I’ve struggled a bit financially. I am currently in school to be a nurse, but I work two jobs to get by. My son saw me struggle to give him the best life possible, and he also works and buys his own car, pays his own insurance, puts gas in his car, etc with the money he makes working. <br><br>We have a great relationship overall, and I am proud of him. <br><br>The issue started when he got a new girlfriend. My son met this girl at school, and she is 23 and in college. We’ll call her Bethany. Bethany is from a wealthy family, and I was a bit skeptical of her in the beginning because my son was so young. However, he brought her over one night to meet me, and she was super nice. My son was an adult and I couldn’t tell him not to date her, so I just rolled with it. <br><br>Bethany would come over a lot, but never on the nights that I got home from my second job late (2am). She would always leave before I got home from my second job. One night, I got home from my second job early because they didn’t need me that night. It was 12:30am and I walked in the door to find Bethany in my son’s bed naked. I was livid. I yelled at her to get out. She said she was sorry and that she didn’t know I was going to be home that night. I told her not to come back, that she was not welcome.<br><br>The next night my son and I got into an argument. He said I couldn’t keep Bethany from coming over, that she hadn’t done anything wrong. I said she was an adult, she knew better. He said I couldn’t tell him who he could date. I agreed that I couldn’t, but that I could say whether Bethany could be in my house or not. He told me he was an adult, and that if he couldn’t have Bethany over, then maybe he shouldn’t live there. I told him that maybe he shouldn’t. He is an adult and makes pretty good money. I told him I couldn’t afford to pay rent for him somewhere else, but if he was an adult and felt like he could make his own decisions, then maybe he needed his own place and he could do whatever he wanted in his own place. He said he was moving out, and he did. <br><br>I am somewhat regretful of it now. He is my only kid. But at the same time, I feel like he is being a huge asshole. I called my son and asked him if he could come pick up some of his stuff that he had left, and if he could bring me some food because I hadn’t had a chance to go to the store in a while and I needed some food. He said he couldn’t today because of work and school, but that he would try to come up Sunday (it’s Wednesday now) to pick up his stuff and bring me the food. I said ok. He told me that Bethany is now his girlfriend and I need to accept it. I said I would accept that he was dating her, but she was not welcome in my home or she would be breaking and entering. <br><br>I am somewhat regretful now because I haven’t had a chance to go to the store. But at the same time I do believe that if he’s an adult, he needs to be fully independent. I am somewhat regretful because I am sad he moved out. I miss my only child.