First of all, as long as you're unsure whether you're really in love, you aren't. When you are truly in love you will know 100% surely and won't need anyone to tell you how you can tell. Here are some signs, but note that it's not like a checklist that you can go through and say "yes, I'm in love" if all of them seem to be true.
You can have a crush on someone.
It could happen
Sprung is the past participle of spring and can also mean being infatuated by someone so no, it is not a curse word.
If you Pokemon is infatuated by your oppenent you can use this in battle to stop your Pokemon from being infatuated.
Being taken with someone has the connotation of being infatuated with that person. It almost always is at least suggestive of some sexual interest, although it can refer to other kinds of interest as well. For example, you might be taken with someone because of his/her talents or accomplishments.
You are probably infatuated with the person.
He was utterly infatuated with her. My mother's infatuated with dieting.
Tagalog of infatuated: nabighani
The act of infatuating; the state of being infatuated; folly; that which infatuates.
I think you mean "infatuated." Infatuation is a near-obsessive romantic fascination with another person. A person can be infatuated with someone they've never even met! Infatuations usually fade after a while.
Mark was infatuated with Rachel, unable to stop thinking about her throughout the day.
You must be patient. Either the one you are infatuated with will split up with their significant other, and you can take advantage of that and move in for the kill, or you can try to move on and find some one else, if you can't stand being patient.