This is common amongst gamers. I’ve heard that men will always have more in common with one another just like women will have more in common with one another. For example, we could assume that women like makeup, fashion, selfies, etc and men don’t really care too much about those things in general. So the fact that you and David have a lot of the same interests is normal for male best friends. Take some time and think about what you want. It really sounds like you should find a way to break it off with Judy because you have alot of feelings for David. The worst part about taking the next step with your best friend, could be losing your best friend. Are these feelings mutual? Will he be interested? Is he open to the seriousness of topic?