Is normal to still have some regrets because of failed relationship?

There was a girl and we were seeing each other. We were not in relationship but things were looking really well. We kissed few times and i thought we are going to be together soon. But then she turned me down. It is like 10 months ago. It no longer consumes me as before but there are still times when i regret how it ended and we didn't get further. I wonder if i could do more. Be there for her more, text her more etc. Sometimes i wish i could tell her all the things I wanted and share life with her. Just watch movies together and talk about stupid things. Maybe i am the one resposible for screwing up and it sucks the most.

Is normal to still have some regrets because of failed relationship?
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