There are two types of Love. The passionate Love and the Companionate Love. The Passionate love is intense and engulfing. The kind that you can’t eat until you talk to them. It feels like you’re on drugs, because there are lots of neuro-chemical stuff happening.
Like someone on drugs, you may see nice things that aren’t actually there, or miss red flags that are actually there. And like every drug, at some point you will become sober, and start seeing the things you missed or realize that they are not exactly who you thought they were. That is the case with passionate love.
Also, at times you develop resistance to a dose, and need to increase the dose to get your usual high, but usually, when people get maried they start doing or being less of what made their partner fall in love with them, for example, reduced effort in appearance.
So, when you need a higher dosage, you are getting a lower dosage.
So they come up to you (a higher dosage) at the time, but you may end up having the same faith as their current wife, because that is what passionate love does to you.
What we should all seek is Companionate love, it is stable, deep and long term.