Situation

Last month my parents went out of town for the weekend and I was home alone. My best friend wanted to come over and I was thrilled because I'd just been through a bad break up and had been extremely lonely and depressed and I hadn't seen him in forever. After he gets there he talks me into breaking into my parents liquor cabinet and then convinces me to drink way more than I should have by telling me that he'd leave me alone if I didn't. He then tells me he's going to leave unless I have sex with him so I let him because I didn't want him to leave. After he's finished he immediately starts to go. I ask him not to and I get to the point where I'm hysterically sobbing and begging him to stay for just a few more minutes because I've just been so lonely and so sad and I didn't want to be alone again. But he didn't stay. He completely emptied the rest of my parents liquor cabinet and left me there alone crying. Looking back on it now I feel like he used me but I don't know because he didn't have to stay. Did he use me or am I just overreacting? Anytime I mention it he says I'm just overthinking it. I also recently found out I got pregnant from that night so apparently he didn't use a condom even though he told me he did. He stopped answering his phone after I told him.