check to see if love is reciprocable before allowing process to proceed".

Does this mean extrapolating how person 2 will feel after they spend more time with person 1? Would you take into account the presence of a third person who might steal the affections of person 2? I guess we could solve love triangles by duplicating people.

Love also doesn't seem to me like a binary event, we'd want to allow relationships that would progress to any level on a mutual love spectrum and then stop people from falling deeper in love when their partner would not follow.