The girl gives you a good night kiss, and her expression is withdrawn and replaced. What does a normal expression stand for?

When two people make friends, they express their feelings in a way, giving you a kiss expression, indicating that they already have you in their hearts, but they withdraw and change to a normal expression. This is for their own love, leaving them room to see how to develop in the future before making a decision, so if you want to love, be bold, take the initiative and make your own decision. This is everyone's idea is different. Good luck and happiness.