Can some guys act defensive/rude when they like a girl?

Anonymous
especially for a guy whos not thinking of marriage or a serious relationship at least I don't think he is and he suddenly meets a girl who kind of gets under his skin, and now he's suddenly defensive around her and rude to her and even mean to her but other times he's warm and flirty and has puppy eyes and can't stop staring? or is he all together a bad guy and one to be avoided?
Can some guys act defensive/rude when they like a girl?
2 Opinion