"I'll be right back I just need to use the bathroom"

Today you were leaving the park with Mike while eating ice cream until he left to go to the bathroom but while he was gone a man who you met at a bar once came up to you "I- is he gone?"

You responded with yes and asked why and he was shaking a bit

"Your boyfriend is craz-"

He then stops and you felt your boyfriend come up from behind you and put his hands around your waist and glares at the man & the man ran away