I think there are things you can do instead of writing a letter that will help you more.
The reason not to write the letter is that you’ve never dated this guy, so writing him a letter is too provocative. This is the kind of thing you do with someone you actually [b]have[/b] dated. But since you and this guy haven’t even gone out, writing him a letter is coming on too strong. It’s going to appear too needy, and in a way, it’s going to be inappropriate — just like your drinking too much and sleeping with too many guys at parties — the letter will be outside the norm of appropriate behavior given your relationship with him. 😉
The reason you want to write the letter is to try and get this guy to ask you out — after you’ve behaved in a way that has probably pushed him away from you instead of drawn him closer. You want to do damage control and further your good cause. But, writing a letter of apology or explanation is just going to make it worse. So, instead….. do change your behavior, and when you see or talk to him, he’ll see what you’re doing. And let him get to know who you really are — but don’t push. Relax. Try not to stir the pot in any way. And just be the person you want to be — not someone who’s needy or insecure.
I hope that helps. 🙂