My former fling is starting to piss me off. Why can’t she interact with me?

I had a fling with someone with my social group. She wanted to escalate things to a relationship. While I find her physically attractive and think that she is a good girl, I just don’t think a relationship would work between us being that she isn’t very confident.

I let her know this and she ended things. She unfollowed me on everything and in group settings she avoids/ignores me or is curt with me. I feel like we should at least be friends being that we have mutual friends. I’m tired of things being awkward between us.
My former fling is starting to piss me off. Why can’t she interact with me?
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