What should I do? I have a crush on my ex's friend, but he has a girlfriend...?

My ex-boyfriend and I went out for 5 years, and he recently broke up with me because he wasn’t ready to take the relationship to the next level and had no experience with other women. At first I thought we might get back together, but now I don’t see this happening.

Recently, I’ve developed a crush on an old friend of ours. I keep running into him randomly at events and on the street, and he always flirts with me and stares at me and gives me a ton of attention. Once, years ago, he tried to kiss me, but at the time I didn’t take it seriously. Now I get the feeling he likes me, and he acts like this if his girlfriend is there or not.

Now I feel like I might like him too. Him and his girlfriend have broken up and gotten back together a bunch. I know he will be playing music at an art event I would want to go to, but I’m not sure if I should go. In the past I have always tip-toed over people’s feelings, but this time I feel it may be worth it, since we have known each other for so many years.