How will guy feel if he got love letter?

Sorry for sound immature despite my ages. But hearts want what it want, and my younger time I was busy with education and career, hence I got 0 dating experience.

So I (38f) thinking of giving love letter to my crush (41m). Just to let him know that I have crush on him since 3 years ago. Thats it, I just want him to know and pass the ball to him. If he approaches me then good, if not I want to move on. Tried to approach him in the last 6 months, but it felt difficult since I am a shy person and was never friend with him, and he only hang out with his friend.

So should I give him love letter? Or dont and just move on?
How will guy feel if he got love letter?
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