<human>: Can you give me the gist of the text in a nutshell?

(All of us 17) Ok so my a friend (m) of mine (m) liked a girl in school.  Over a text he told me she was one of the prettiest girls he's ever seen. being his friend I joking say I'm gonna send her a screenshot of what he said because he can't make the first move. He's calls me out and says I won't, so naturally I do send it to her. We had a nice conversation and she calls him cute. The next day I showed my friend what she said. My friend decided it'd be funny to send her a text says "I love you" from my phone.  I Immediately replied "I didn't send that it was someone else". I wasn't mad because would've probably done same thing and it was funny. She replied "[my name] I know that it was you". What does that even mean? I haven't said anything to her since. It's been about a month now and well my friend lost interest a long time ago but now I've developed a crush on her but have no idea what to do.  My friends cool with it but thinks there's no way I'd ever get a chance. Any advice on what I should do? I'm actually really do like her.
<bot>: friend messages a girl "I love you" from my phone. She thinks I'm weird and I get a crush on her.