I refuse to let her go because I love her?

Okay so long story short I asked this girl to a dance and got rejected. It's five days before the dance and the guy she was planning to go with (the reason I got rejected) has treated her like a complete asshole and also planned to leave her at the dance so he could go bang some other chick. The girl I wanted to ask now knows and I doubt she's gonna still go with him. So my question is what do I do? I heard from very reliable friends that she liked us both but had a history with the other guy and that's why she chose him.

I asked her again today and asked if it was a not in a million years situation and she said yes. Well I'm going to keep asking. Even if I don't go with her I'll still do sweet things and stuff like that. I won't be creepy about it. I'll be nice and just slide the occasional "how about now?" and as the gifts get better on valentines day I'll ask her if she can be my valentine. I love her and I'm not going to let one word get in the way. I don't want her. I'm not obsessed with her to the point where it's creepy. I want her to be happy. I remember everyday I would make her smile and laugh.

So my question is is this okay? Is it okay to not go out with her but still show her my affection? She's going through some hard times right now and I just want to be there for her without being creepy or a jerk in anyway.