MCs slept with eachother but MMC is furious

Where MCs slept with eachother, one night stand but MMC is furious maybe because he thinks he got tricked by FMC & she had some masterplan to trap him or maybe he had not yet accepted his attraction towards her, the reason could be anything. I just want him to be angry & let FMC knows that he is not happy.

Bonus point class difference, unrequited love