Lost ex and friends

When my bf and I were together (for 2+ years) we'd go to his best friends house most weekends and get together with the same group of people. This was the only time I saw them, but I still felt close with them. Anyways, my bf and I broke up a few weeks ago, so I don't go to his friends house anymore.

It feels like this void in my life now, I feel like I lost my friends and my drinking buddies. I have to force myself not to open their weekend snapchats cause I don't want to see my ex yet. I saw all of them often enough that I never texted with any of them, I just feel weird trying to reach out to any of them now, idk what to do. The person I was closest with whenever we got together was a guy that I graduated with, don't have his number I just don't know if it'd be appropriate to message him on fb when he still hangs out with my ex. I am trying to make new friends, I just miss some of my old ones. And no, I'm not attracted to this guy I just enjoy his company. Idk, is it best to cut all ties or is it ok for me to reconnect with this guy?