My boyfriend left me crying and went to party?

So I've been going through a tough time lately. Im not gonna get too much into it, but one of the things that happened and I found out just this morning that I am pregnant. I'm not ready for that responsibility and there's so much I wanna do before that, so I decided to get an abortion, which I'm really scared of, but it's the only option for me right now. I told my boyfriend this the same day and he was supportive of my decision. However, I still wasn't feeling well and I was balling my eyes out later that day when he was with me. He then got invited to a party and decided to go. I tried to not mind that, but it honestly kinda hurt that he would leave me alone in such a vulnerable state. I expressed how I felt and he tried to calm me down, but seemed like he didn't even think about staying with me when I needed him most. Again, I was crying and was obvious that I wasn't feeling well. He went anyway and now I feel so alone. Is this okay? Am I overreacting?
My boyfriend left me crying and went to party?
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