My friend is falling for my old fling, what do I do?

For background information I’ve liked this guy for over 10 months now, he is me and my friends group. She’s known about my crush on him. My other friends, also in the group, would also always tell me that I shouldn’t date him cause dating in the friend group is messy. So I told all of my friends including her back in April that I was over him, I’m currently not over him at all. I knew I had to move on cause I wasn’t very sure he liked me back. The only evidence I had of him liking me was him staring at me and his friend saying that he might like me (he is very shy). Last weekend my friend told me that she and him have been talking a lot and she really likes him. She is not sure if he likes her back cause she asked him if he’s interested in anyone currently and he said no. She asked me for my permission and I said I've moved on from him and gave her my permission to go for him. I know I shouldn’t have cause I still like him, but why should I keep holding on to him when I’m not sure if he liked me back the same way. Basically what I’m wanting to know is how I should get over him fast. I know seeing them together is going to break me and I don’t want that. I really want to be happy for them, but I can’t keep letting my feelings get in the way.

My friend is falling for my old fling, what do I do?
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