He's still hung up on his ex...should I wait it out or run?

chloed
Me and him aren't really dating...just hanging out and getting to know each other. We haven't done anything besides making out. He acts like he's into me...we talk and see each other all the time...at least 3 times a week. But he told someone the other day that he is still sad about his ex girlfriend, whom he broke up with a year ago. She left him for someone else. I know this is a red flag...so should I stick around and keep getting to know him and see what happens? or should I run? He is a great guy...definitely not a douche, so that's why I'm not sure what to do. Any suggestions?
He's still hung up on his ex...should I wait it out or run?
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