dating while engaged

I met a girl. She's become a friend. She apparently knows who she is going to marry. On top of that she has a different boyfriend now. And a online boyfriend to boot. What do you all think of that?

Personally? I've never felt right about dating someone that already had a significant other of sorts. I would break it off. How can you expect her not to do the exact same thing to you if you two were to end up together somewhere down the line? I couldn't trust someone like that, but that's just my honest opinion.

I would avoid that person all together. I believe that if you are not happy in a relationship then you should at least have the respect to tell your current partner how you feel and break it off before starting a new relationship. Considering that they are engaged that would mean they are cheating on their partner whilst knowing that they are planning to commit to them. Its morally wrong on so many levels.