Feelings for a Cousin's ex

Hi everyone, I'm new here and in need of some advice. To begin with, let me say that I'm very inexperienced with the dating game so I apologize in advance if this is a no brainer issue. I'm looking for advice, not insults. Thanks! Ok – so for starters my cousin and I were never close. We were more or less acquaintances rather than friends. We're pretty opposite personality wise. I'm down to earth and friendly, she's more on the loopy side and can be easily taken as stuck up. Many, many years ago (10-15+) she was in a long term relationship with a guy. I want to say they were together for about 6 years give or take. When they were together we all hung around at the same spot pretty frequently and I had grown rather attached to her BF as a friend. Even though I wanted much more than a friendship I never acted on it out of respect for my cousin. When they broke up my friendship with him got stronger and we got closer. Eventually he asked me out, but I was too nervous about what my friends and family would think so I turned him down and we then lost touch for years. We've since reconnected and are getting to know each other again. I'm already feeling that spark once again and I'm developing romantic feelings for him all over again. I have not acted on those feelings yet. I have no idea if he's feeling the same or not. As for my cousin, she has since gotten married and had kids. As far as I know she has no contact with this ex. Where we don't really have a friendly relationship even to this day I don't feel that asking for her permission to see her ex is in order. I mean she's moved on with her life, it's been years. Am I right in thinking this? I also know that there are "more fish in the sea" and that I "don't need to date my cousin's ex", BUT part of me wonders if he could be the one for me. I know it's still too early to be thinking this seriously, but we're both available and as friends we're really compatible. What harm would there really be if we did try a romantic relationship? I mean just because he's my cousin's ex doesn't mean we couldn't be a good match, could it? Would you consider dating a cousin's ex under these circumstances?

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