Can I be married and crush on another guy?
What do you mean by "crushing" on another guy?
He's cute, so I like to fantasize about him and being with him.
If you are married, you should focus on your husband instead of admiring and crushing on other people. You are crossing a line by fantasizing about the other man; you should not be encouraging yourself to develop feelings for someone who is not your husband. You should focus more on your marriage instead.
I have fantasies too. I'm not saying that I'll be going and have sex with him, but it's a fantasy.
As long as your fantasies stay fantasy then it can't harm anyone. You should try to rekindle that kind of adoration for your husband though and see if you can get your mind off of daydreaming of anyone else.