OH is going on a stag do to Benidorm in may, which is fine, he told me months ago but no exact dates. Told me the dates yesterday which were Friday to Monday but now today he said he’s going Friday to Tuesday (him and one other pal, the rest of the stag do are coming back Monday) because the flight back is cheaper Tuesday. I could tell he was lying so I checked the flights and they are the same price both days. I told him I’d checked and asked why he felt the need to lie, if he’d just said I’m staying an extra day I would’ve been ok with it but the lying really ps me off!! He’s pd off with me now because I checked the flights and didn’t just believe him. AIBU?