So my SO recently graduated from my college and whenever he visited, he would stay with me. He said he would be visiting yesterday, but I'm away at a conference until Sunday. He said he would find someone else to stay with because he really had to get some info for grad school applications. He texts me today saying that he stayed with this girl (he slept on the floor), who in the past, has stalked him and still has an obsessive crush on him to the point where I can't mention us together because she will flip shit. He has said he really doesn't like her and wanted to cut ties with her after graduation. While I'm happy he was honest and told me he stayed in her room and slept on the floor, I'm also pissed off for some reason. What do you think?