Is it normal that i suddenly feel lonely at college?

My first semester at college was amazing because I found a boyfriend right away (accidentally, actually) and he was always there for me and very loving. However, around February, I realized the relationship was unhealthy because it had cut me off from making friends. He was more controlling than I realized, and he was also depressed and didn't have very many friends himself. We spent all our time together, but he didn't understand when I would tell him I need time to myself or time away from him to be with my friends. So we broke up.

Now I'm struggling with rebuilding the friendships I first made when I got here. I'm not a super social person in general; meeting my boyfriend was just a happy accident and now that he's gone I feel pretty alone because he was my best friend. I'm an introvert, and I often feel like people forget about me. I'm also in a single, so that adds to it. It's difficult for me to reach out to people because I'm so quiet, and while I have a bunch of acquaintances here, I only have a couple of really good friends. I just feel alone because I miss having someone around who's close to me. I don't really know how to deal with this.