I may wish that I had never hurt some people, or treated them a certain way, but every mistake has taught me the lessons I know today. Do I wish I could know what I know now an easier way and go back to change things? Absolutely. So in a way yes and in a way no.
I don't think I need to. He's mine. He doesn't care about that girl ✌ at all. And if you are her? Get over yourself you aren't anything special in that boys eyes. So sorry.