Is feeling like this normal?

I broke up with my now-ex (3 weeks ago). He was a great guy. He was always there for me, remembered the little things, went out of his way to make me happy, made me a priority even though he was busy, etc. But, he just seemed kind of boring - didn't like going out and partying like I do. The one-on-one dates he planned were romantic, sweet, and fun, but I guess I just got bored and it bothered me that I couldn't take him to a party since I knew he wouldn't enjoy it.
Now I'm starting to miss him, even though I know most of the time we wouldn't really have fun together. Is it normal to feel this way? Does this sound like regret?
Is feeling like this normal?
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