A crush that begins innocently enough might begin to cross the line into emotional affair territory if remaining unchecked. One telltale sign: 
when you are getting news, good or worst, will be your earliest impulse to inform your crush or your lover?
“A guide when explained, ‘You know you’re a great fit once mate may be the first person you want to determine very good news, and also the very first you wish to inform bad news,’” Howes stated. “Is that confidant your partner or your own crush? Whether your crush begins to compromise the physical or psychological intimacy you’ve got with your major partnership, or you’re stoking dreams about that taking place, you are in harmful territory.”
Hardie-Williams told HuffPost that it’s important to be honest with yourself. Within heart, would it be really “just a crush” or is there some thing more there?
“If your own crush starts to undermine the real or mental intimacy you’ve got with your primary commitment, or you’re stoking dreams about this taking place, you are in harmful region.”
“Also, it’s extremely hard to have a crush on somebody in which there’s been earlier involvement. That’s labeled as background. A crush is not a reason or an invitation to get across the range behind the significant other’s straight back .”