I don't think it is necessary to AMOG the guy. Just don't care about it. You want the girl, right? Not the dude. So focus on the girl, and ignore the dude.
Other than that, I agree with HH about being assertive. This goes for basically everything you say or do. Here's a sample from not so long ago.
This was a girl that I had some things going on with during summer, though she didn't really felt like cheating on her boyfriend, and so she rejected my kiss. Which I didn't really care about. She is from abroad and I kind of have no idea when we're going to meet next time. Couple of days ago I was curious how she was doing and things started getting hot pretty soon, it's not too important, I'm skipping most of the conversation and only pasting here the relevant part(using assertive language)
Quote:
Me: By the way don't think I've given up on tasting your lips. I swear the next time I see you I'm going to kiss you.
HB: I wish we had more fun that night. I was worried about my conscience because of my boyfriend but then I realized I can't get mad at myself for having fun.
Me: Like it is with every good thing in life, you have to wait for me, hun, it's not easy to get to you.
HB: I can't wait...
Me: Check your phone often. You might get a text from me to come pick me up at the airport some other day.
HB: You're crazy.
Me: Thanks, good night.
Make note that
a) I don't give a damn about her boyfriend. I don't mention him, I just act as if he didn't exist.
b) I don't ask for permission.
c) I'm not buying any of her BS and just do and say whatever I feel like.