Can Someone Be In Love With Two Persons At The Same Time ?

UNEDITED STORY

My GF was in a relationship when I met her and she admitted it to me, but I was able to dislodge her BF, but she admits that she still feels some little love for her ex- and that I should help her forget her ex-, she feels bad because her ex- didn't do her anything wrong as the guy already knows about us, but she admits that she does love me sincerely and I can conform to that by her actions. 

So now my question is this, does she feel true love for the both of us ? can it be said that she is in love with two persons at the same time ? Please lets debate.. Mature minds only.. Tnx.. Any reasonable advice on how to help her forget her ex- would be appreciated, she wants me to help her forget him ( I don't need advice on S**X please )