Woah woah woah. Just because she has a boyfriend doesn't mean she wouldn't be interested in you and there's nothing you can do, especially if he's a new thing. Damn son, just try it. What's the worst that could happen? You've got to find some confidence somewhere and you aren't going to find it by sitting back and doing nothing. Yeah, you might crash and burn on your first several attempts, but it's all part of working up to the confidence you need if you don't want to be foreveralone. Just like with anything else, practice makes perfect. I know how it is though, because just a year ago I was exactly like you, and I haven't even made a ton of progress from there. I'm fortunate enough to have acquired a suitable mate for the time being. She also had a boyfriend when I first started talking to her, and they were in a multi-year relationship too. I saw how they were together, saw the things he was not providing her that she desired, and filled the void. I learned from his mistakes and came out on top. Like a baws.