What does blue heart mean?

With the development of the Internet and the popularity of Chinese characters, there are basically many Chinese characters in people's chats, and there are many that they can't understand. For example, recently, everyone is very confused about Blue Heart. If someone gives you a blue heart, it means you are a spare tire.

In feelings, I believe that many people hate the spare tire most. They pay a lot, but say nothing. The other party not only doesn't love, but also raises his own pastime with an ambiguous attitude, and builds his happiness on the pain of others. Such people are really selfish. However, it is difficult to get out of trouble, even willing to be a spare tire, just praying that one day he/she can see himself/herself again.