Hear me out 😔

sheeesh I haven’t vented on here for a while. Sooo today I had a shitty day. sooo I was talking to the boy for a week. (Yeah it’s a short ass amount of time) but he made it serious and deep real quick. He had a different vibe than I anticipated in a good way. He sounds very mature and told me he was looking for someone serious. First time we hang out we were very direct. I ask him was his intentions are if he just wants to have sex or trying to get to know me. He said trying to get to know me and asked me the same thing. We hung out several times, he told me deep stuff about his past and kept saying that he really liked our vibe and he was comfortable around me. He told me about his past relationship and how it was toxic and unhealthy. The first day he told me this I directly asked him if he was over her cause I was not going to wait. He said yes. Anywho we continue to talk and I’m intrigued which doesn’t happen often. For a split second I thought wow this might actually be something. Today I was walking back to my dorm, I see him in his ex gf car with her... I’m thinking I was a rebound or whatever but when we hung out he never tried to come on to me. So Im confused to what was his purpose of being all deep and serious when it could’ve just been casual from the start. And he didn’t gain anything from it because we never had sex... I just feel like I got my hopes up. You just can’t lead someone on like that.