Should I tell her something?

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Hi /adv/

I am an asshole.

>last year
>fwb with this girl flatmate
>no one else knew, kept it lowkey
>it was fun, we both did it as a stress release
>no commitments
>I had to leave for summer, she was kinda sad about it but we left on good terms
>talked a bit during that summer
>felt like she needed more attention, I felt she wanted something more
>got scared when I came back, got autistic about it
>didn't talk to her, avoided her
>she got a boyfriend, happy about her
>we avoided each other
>she avoided the flat, moved out with her new bf

I am not jealous, not angry or sad (and I have no right to be), but I was a complete douche by not talking to her after that summer, and I feel like she might've had negative thoughts that could've lead into "fuck I'm this and that, he's avoiding me because bla bla" and I hope she just got over me and considered me just an asshole, but I want to say something, I want to tell her she's been amazing during our time spent together and that she shouldn't see her as anything but that.

My question to you, /adv/, how do I make it right? Is there even a way to make it about HER and not about ME? Because I don't want to do this if the only thing I could accomplish is inflate my ego by telling her 'yo it's cool you're cool' or tell her a sob story. I want to keep it real.

I fucked up, I'm sorry.