realtionship problems

me and my gf have been dating for 3 years she had a friend she admitted was attractive but she has trouble making friends so i said its fine they usually only hang out in a group setting she would always come to me asking if she is crossing any boundaries like them staying o the phone for long periods of time etc and talking a lot but its usually when im busy and never behind my back she even asked sometimes if she could hang out and lay basketball together and there was. point where i asked did you like him she said no i said okay i believe you then after they went to play basketball she realized she was kind of iffy about her feelings then we broke up because she wanted to figure out why she felt that way and if the relationship is for her or not and maybe this isnt meant to be with me and then we stopped talking because she wanted to see if she needed to speak to other people she talked to 2 people or at least tried to and wasn't interested i guess is this emotional infidelity