Your boyfriend was ignoring you because you were refusing his kisses...

Your boyfriend was next to you and a random guy came up to you and he was flirting with you, your boyfriend was mad that he was flirting with you but not him,

Your boyfriend then stepped forward and said "Hey are you her boyfriend? Cuz I know damn well she's not because She is mine, so back off!", he says while grabbing your arm gently, moving you away from the guy,

And so did the guy backed off and walked away.