My girlfriend left me for a girl, how to move on?

Daemuss
I shouldn't say girlfriend anymore but w/e. We have been in relationship for 5 years and everything was going great, but 2 month ago, she kissed one of her colleague. She told me about it and felt bad, but the seed was planted... She always had fantasies about women but never experienced any crush or attraction to any girl. The colleague started to flirt with her, texting stuff like "I want to see you" etc. My girlfriend was back then very confused because she didn't want to stop our relationship but was clearly attracted to this woman. So we took a break and 1 week later it was over. She had sex with the girl and enjoyed herself.
So, I was like "she is lesbian, there is nothing you can do about it, move on..." but 10 days later, she came to pick up her things and she was clearly feeling attraction for me and she said she was still confused about her sexuality. So now, it s harder for me to move on because I think she might be bisexual and that something between us is still possible... please help me... :( (sorry for my English by the way, not my first language)
My girlfriend left me for a girl, how to move on?
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