How to confess to an old classmate whom I haven't seen for years?

Let's get to know how she changed from six years ago. The key is whether you like her shadow and sense of youth six years ago or really like her now. You can give her a hint when you have the opportunity.

If you really like her and don't want to give up, you can care about her silently and move her slowly. But if she doesn't like you, or has a boyfriend, you'd better not tell her yourself, lest she be embarrassed, and it's unnatural to keep your distance as a friend.

As for the result, it doesn't matter. If there is no fate, then bless the person you love. It may be sad to see her happy, but it is also another kind of happiness, the sublimation of love.