To the most important thing first.
The Bible does not cost a thing. Click on the link and read it for free.
They say the best information is free - and in this case it's true.
Now:
Are you sure you want to be with her again? Or is it an ego thing? the I want what I can't have.
That's for you to figure out.
You got her once before - and you can do it again.
But the only problem is - now your thinking more like a girl and not like a guy.
Don't tell her your FEELINGS... don't tell her what you WANT to do - just do it.
Being needy has never got anyone.
So do what you did the first time.
Let her make it up to you. Go out and have a blast with her. Intitate physical contact - tease her, all the usual stuff.
Then when your done, drop her off and gone home and take a cold shower.
Follow up with a call a few days later to set up another date.
Don't worry about the other guy - don't panic or stress just do your thing.