Why he would act this way with me but not with the others?

There's this guy in my group of friends who I've been flirting with since a while now. He callsme by sweet and cute nicknames from inside jokes between him and I.

I started to notice more and more lately that when he will joke with others he will never apologize to them, but he does with me, even if we both laugh at his jokes. It kinda looks like he is scared of offending me or something.

Why would guys act this way?

Why he would act this way with me but not with the others?
Post Opinion