Someone once asked...
Someone answered with kindness...
When the moon hits your eye like a big pizza pie
Another soul answered...
You do not know until you are out of it.
Another soul answered...
If thinking about the person makes you smile mentally. If you wake up one day, and without hesitation, shift your plans around to visit them. Typically speaking, being in love, is a slow burn. You'll know it when you feel it. It is a feeling that inspires many to write poetry and to move mountains, and just as much, when love is broken or gone, feel the deepest pits of despair.
Another soul answered...
if you're asking, you already are. don't fight the feeling invite the feeling.