my man went out last night and had arranged to be dropped home by his mate at the.end of the night.

instead his mate was slack and didnt want to so he stayed over the night. im annoyed as there are other girls living there and we had planned to spend the night together at.my.mums as we are visiting another state at.the moment. he shouldnt have put me in that situation where he slept somewhere.else with other chicks. am i wrong to be pissed about it？