Should I attempt to contact an old EP friend?

I kept his number in my contacts, mostly because I'm always too lazy to take out old numbers. (It's true, I still have some of my friends and family's old numbers next to their new numbers.) I'm not even sure if it's his number still. Should I just check? And if it's still his number, would he think it's weird I kept his number?

We kind of left off on a bad note. Well...not really a bad note. Just awkward I guess. Should I go for it or leave him be?