internal conflict

Long ago about a year ago, I decided to start going out with someone. but there was also another person in my life that I had a very close relationship with and was hoping got take it a little further. but I never did. when I started going out with the one girl, it wasn't good at all. she seemed to scared to open up. and we never really had fun. but then my friend was always there and we always had fun. so inside I was battling with myself on which person to be with. should I break up with "a" and go out with "k" or stay with a and try to be miserable. well I ended up staying with a and k moved on. I rarely talk to k anymore and when I do its just not the same. I sometimes wonder if i made the right decision but things have a way of working out.