I have a crush on my ex girlfriend's best friend?

99Murica
I dated this girl about a year ago for 2 months. So I just want to mention that the relationship was pretty short.

Well here is some backstory. I ran into my ex girlfriend's best friend at a party recently and we talked for about an hour and then started hanging out again as friends. From hanging out with her I found out that it turns out she is a much better match for me than my ex, and she is the one I should have been after. I am also extremely attracted to her and I know she finds me attractive too. I hate burning bridges and I've never done anything this messed up before but I really want to pursue her and I don't know if I should or not. Could I get some advice?
I have a crush on my ex girlfriend's best friend?
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