I think it’s okay to tell someone your feelings for them, if and only if you don’t make it their responsibility to manage and regulate those feelings.

All relationships are reciprocal to a degree. Liking someone is normal, if they don’t reciprocate those feelings that’s okay, doesn’t mean anything has to change. If you respect them as a person and don’t just see them as someone to fill a role in your life then you should be able to sublimate romantic feelings into a healthy plutonic feelings.

Don’t force anything, pay attention to expressed boundaries and learn to differentiate for yourself when you’re giving too much.