Same goes for a girl and two guys. I posted a Actuall Advice Duck about this ages ago:
.
If you and a girl are getting serious, but you learn that another guy is making her feel like she needs to make a choice, leave her. Immediately. If she was that serious about you, she wouldn't feel that way.
.
If you and a girl are getting serious, but you learn that another guy is making her feel like she needs to make a choice, leave her. Immediately. If she was that serious about you, she wouldn't feel that way.
http://m.funsubstance.com/fun/103566/i-learned-this-one-the-hard-way/