AITA for not letting my son’s girlfriend move in with us because I don’t like her?

My (43M) son is 18 and graduated high school with an associates degree. He’s done a semester of college but not anymore this semester he’s his girlfriend’s (22F) sole means of financial support since she moved out of our house. <br><br><br>His girlfriend was the outgoing type of girl in high school so me, his roommate and now boyfriend met her when she brought home her high school sweetheart (now wife) at the beginning of their junior year. I worked with her parent in my industry for over 20 years. We all sort of became friends, including her and my son. <br><br><br>Well her high school sweetheart dumped her during their junior year for what turned out to be a stupid “it won’t last” thing. My son took advantage of the situation and dumped her himself, but then ended up falling for her when she got dumped by her ex-husband. This was around the time my son turned 17 so obviously things were physical between them when she was 17 and he was 17. They’ve been together ever since, despite me not liking her very much and telling my son so on numerous occasions. <br><br><br>Well after my son graduated and started working he became her guardian angel. He pays her phone bill, her car insurance and rent. I told my son numerous times that I don’t like her and that I don’t want her in our house. She’s a bratty, spoiled rich girl who abuses everyone around her and I specifically told my son that I would draw up a trust over my assets instead of him if she was in the will when she moved in with us. <br><br><br>He moved her in last weekend and I drew up a will. I brought it up to him today and told him I drew up a will over him should she ever move in with us. He’s upset and his girlfriend is more upset. AITA?