Ex and new girlfriend - what should I do in this awkward situation?

I think coming up this school semester I'm going to run into my ex and his new girlfriend. I was the one who basically rejected him and I remember him being pretty tied over me.

I feel like his girlfriend might be a little strict. Whenever I need to contact him for something he tries to avoid conversation. I'm guessing his girlfriend knows about me and might be a bit insecure? I don't know. Exes shouldn't really be in contact too much anyway I guess.

Either way, I volunteer at this club I'm most likely to see them both at. What should I do if they encounter me for club stuff like me needing to check them in or something?

Ex and new girlfriend - what should I do in this awkward situation?
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