Does jealousy actually do anything?

My Princess gave the Tank a gift and the Flower showed up. She likes the Tank and is jealous. Then the Tank gave a gift to my Princess and the same thing happened. The Flower is very jealous, this time she said “it’s always (Princess)” and got sad, but does this have any effect? She isn’t mad at either the Princess or Tank, so I’m not sure if anything will actually happen.