True love cannot be exchanged.

If you work at a company for three years and then jump ship to another firm in the same industry, they'll recognize that experience. The new employer will pay you based on the market rate for three years of experience, not as a fresh graduate. That's called exchangeable.

You love a man, have three children with him, and then leap into marrying another man. Those three kids? He won't claim them, get it? He'd rather marry someone without any reproductive history than you with three births under your belt.

True love is such a special thing. It's precious, but not universal. It's scarce, yet it can't be exchanged.

A petty person needs you to respect him. A great person needs you to understand him. If you can't naturally understand, you learn to do so. This is a top-tier clash of human nature.