People's hearts can't be exchanged for sincere feelings. So what?

Not all people can talk to each other about everything. More importantly, they are insincere and irrelevant. Not all people can talk about everything, but some people pass by your world and forget to leave you a lamp. People's sincerity can't be exchanged, because some people exchange their sincerity for your indifference, some people exchange their sincerity for your deception, and some people feed your sincerity to dogs. People's sincerity can't be exchanged, because your sincerity is taken for granted, while others' sincerity is taken for granted. You think your sincerity can win the sincerity of others, but you are wrong. The sincerity of others may be just a whim of others. People's sincerity can't be exchanged, because your sincerity is regarded as a cheap thing, while others' sincerity is regarded as indifference by you. You think your sincerity can win the sincerity of others, but you are wrong. The sincerity of others may be just a whim of others.