Every man continues in his current non-single relationship state (dating, just good friends, chasing, no-strings-attached, in love, married) unless acted upon by a force internal (dramatic negative behaviour by woman like nagging, extreme indifference etc) or external (subtle positive behaviour by other women like smiling, cleavage-flashing, PDA etc).
(Click on thumnail to see full comic on a seperate page)
Men are inertiatic.
The rate of change of a man’s interest in a woman is directly proportional to the force (external or internal: see First Law) and takes place in the direction of the force.
To every female action towards changing the First Law and/or implementing the Second Law, there is always an opposite reaction, at least verbally. Equal or not depends on the stubborness of the man concerned and could determine which way the relationship swings from there.