How can I move on after my fiancée cheated with a colleague at their works do?

Young drunk woman sleeping on the toilet seat after she vomited

DEAR DEIDRE: MY fiancée turned up at home at midday looking completely dishevelled after her Christmas party.

She’d stayed in a hotel and I think she was still drunk when she admitted to having all-night sex with a colleague.

I was gobsmacked when she delivered this news but casually went upstairs to have a shower.

She’s talked about this guy for ages. He’s 25 and he took my girlfriend...