“Boyfriend” likes other girl

So my crush asked me it last week and he seemed very happy about it over text but this whole week he was very awkward and wasn’t making a move at all. I tried too but it never really worked out. Today, a week after we started “dating” he told me he likes another girl and broke up with me. I was very nice about it. I have homecoming tomorrow (at one of my old schools with my friends) and have to sit with him on the bus on Monday and I’m sure that will be awkward. Any tips on how to get over him fast and be less awkward when talking to him?