3.
Fun Fantasy
Your crush is one of those crushes that are fun and dreamy, for the most part. It's the kind of crush where you drift off into fantasy land and think of how amazing your life would be if you were with them. It can also be the type of crush where you kinda know deep down it probably won't ever become a reality, but you are still hopeful that it could happen.
This is common with celebrities, teachers, bosses or even someone who is married. This can also be common with an attractive guy or girl who you've never actually talked to or maybe just say hi to once in a while.
Depending on who your crush is, maybe try talking to them to see if you can move your crush from a fun fantasy to an possible potential? If you haven't spent much time with them, attempt to get to know them better and see how it goes.
However, if your crush is already committed, a celebrity or in a position that could possibly mess up an area of your life, then don't allow it to go any further than the fantasy. It can be fun to think of how your life would be with that person, but there are some crushes that just shouldn't be acted upon. If yours is one, just enjoy it for now but make sure you don't take it further than it's meant to go.