Twin Flame

My Comment: Sounds interesting! Even if it fails, understanding all this can evolve you spiritually for sure and that's the ultimate purpose of life to attain self-realization. It's better to take it as a play as the other person has his/her own freedom and it may not be a real concept but good suggestions to evolve spiritually and have healthy relationships only. 

5 Hidden Signs: 

Inner Peace

Telepathy

Synchronicity 

Detatchment 

Runner's Shift