If you think someone is cute are you crushing on them?

It depends on whether you have a boyfriend/girlfriend or not. If you have a boyfriend/girlfriend and you know you can't love anyone more, then no, you aren't crushing on someone you think is cute. If you have a boyfriend/girlfriend but you want this cute guy/girl more, then yes, you are crushing on them.

You can't hide your crush from your girlfriend/boyfriend so you have to slowly break-up with them, by slowly starting to hang out with this cute person.

If you don't have a boyfriend/girlfriend then yes, you are crushing on them. But don't ask them out or anything if you are crushing on someone else too.