I'm missing an ex/Not that attractive?

So I kind of miss my ex.
We broke up about 2 months ago and have been at NC for around a month and I've started to miss her more than before. I don't know if it's because I got used to having someone there for me?
she's not even that good looking, just average which kinda confuses me what's making me want her back. Probably the fact we were good friends and had some good times. Our relationship had its highs but also a lot of lows and I don't think a future with her would be a happy one so..

Any tips?
I'm missing an ex/Not that attractive?
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