<human>: Hi Reddit! Long time lurker, first time seeker of the hivemind's advice.  This feels so surreal!  Before we begin, I'm not here for karma or upvotes.  I really would like to hear your thoughts on this.

I was out with a bunch of friends last weekend and I met a girl through them.  She's demonstrated interest in me (she was attached to my side the entire evening) and she's very cute, only trouble is that she is engaged to a man who has cheated on her.  Nothing happened between us that night, because I put up some walls to ensure that things wouldn't get messy.  My overriding view on this is that she's unavailable as long as she's got that ring on her finger.  She tells me she doesn't trust him and I get the overall impression that she's not happy, but she's too afraid to do anything about it.  Still, that's not my place, especially because I don't want to have to write a song called "I got punched in the nose for sticking my face in other people's business".

The only reason I'm here is because I realized today how similar this situation is to the plot of The Wedding Singer.  I would love for a chance to make this girl happy, but it would mean I'd have to be bold, confess to her that I have feelings for her in return and take control of the situation like a boss.  I just can't convince myself that it's a good idea, but I would like to know what you would do.  I'd especially appreciate hearing first hand experiences!

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Girl who is engaged to a guy (who has cheated on her) has expressed feelings for me, but I feel like it's not my place to get involved.  What do?