There is a difference between that feeling of love and being "madly in love."
What is going on in the head/heart of someone [...]
"I would like your wise opinion about how to deal with my husband who is involved with another woman. He's coming today & I told him I want to talk but I don't want to argue."
Though limerence by its very nature is relatively short-lived (typically lasting somewhere between 3 months and 36 months) it is a very real and intense emotion/feeling. When a person decides to leave a limerent relationship, or if they are the one abandoned by the other, the emotions don't immediately disappear.
Most people have never even heard of the word “limerence.” But if someone has heard of it, they probably ignored it because it didn't seem to make any sense. Limerence is a feeling of being madly in love with someone. It is a euphoric sensation that has no comparison.
You suspected it long before you knew it for sure. Your spouse changed but you couldn’t quite explain the changes in a way that seemed to make sense to anyone else. You thought that you were imagining things, being insecure in thinking your spouse had someone else.