So I have a friend of a friend who asked me out years ago and was interested in me for a while. I'd just broken up with someone so I wasn't that bothered. Since then I've changed my mind about him. The last time I saw him he was telling me about his new girlfriend but I know now from social media that they're not together anymore.
How do I ask him out without seeming like an online stalker? He obviously has no idea I know. I haven't seen him or our mutual friend for a year.