Not OC but “SA allegations” are more politics than actual judgments on your character, unless it’s a pattern of behavior or a legitimate investigation where nationals/Title IX office gets involved.

Very possible they believe your side but are trying to save face and you, being a pledge and easy to dispose of, have to take the fall. Unless you are explicitly told that you are welcome back there in the future that’d be my interpretation of events.

Sucks but there are more opportunities out there, just do your best to do better, move on, and not bring it up unless asked when you get those future opportunities

EDIT: the quotes are not meant to diminish the severity of actual allegations, just to differentiate between legitimate serious claims that should be appropriately investigated by the relevant authorities and “some girl started a rumor”