I am walking inside a mall when I see my girlfriend who looks really nice today, but then I see a man following discreetly behind her

the man looks as if he’s in his 60’s and continues to follow her. I decide to do something about it and she’ll thank me later

I walk up to her without any warning or anything and give her a passionate kiss on the lips while glaring at the guy behind her telling him with my eyes if he goes near her I will fucking kill him