<human>: Give me a shortened version of the text

I'll try to keep this short, but I went to a party with one of my guy friends (let's call him Johnny) and one of his girl friends (let's call her Laura). Now, Johnny and Laura are good friends, but that's all they are - *friends*. 

Johnny likes Laura, but he's too afraid to make the move. I encouraged him to do it at a party the following week, but he didn't do anything, and I got the feeling that she's not into him sexually.

Meanwhile, I've hung out alone with Laura twice or thrice since we met, and I like her too. We've watched movies at my place and gotten dinner together, and tonight I asked her to a dance on Friday. She said yes.

Now, the thing is, I like Johnny. He's the nicest guy I know, and now I feel terrible asking Laura out when he's told me he likes her. 

What should I do? Regardless of what Johnny says when I inevitably talk to him about this, I'm gonna go to the dance with Laura. How do I approach that conversation with him? More of a "sorry, man, but she's not that into you, and I think we have a thing going" or more of a "hey man, just wanted to run this by you?". Or should I semi-lie and say something along the lines of "hey, she wants to go with me, is that cool, man?"

Please spare me the you shouldn't have asked her routine, I feel terrible but they were never going to become a thing, and I had a chance I wanted to seize. Thanks everyone.
<bot>: Friend introduces me to girl, he likes her, I like her, me and her are going on a date on Friday. How do I keep him as a friend and still go to the dance with her?