They say love blinds a man. Literally.
So, when a man is in love, he often doesn't see anything else besides the smile and tears of his lover and that's all he cares about.
He doesn't see the bad things their lover does. They might see but are very tolerant and even learn to live with it.
Their lover might be unreasonable but because he loves them so much, he bears with all of it.
And the stronger his love becomes, the blinder he gets to the point he would even try to cover up murder for his lover.
He doesn't try to take a step back to see the light of what his lover does. If it's wrong or right. None of that matters. What matters is the comfort and happiness of his love.
Nothing else matters.