This guy who has a girlfriend keeps snapchatting me?

I have known this guy since middle school. We reconnected and have been talking for a few years now.
He will snapchat me about every other day. Even if i dont respond there will be a snapchat from him at least once a week. He tried to date me when he was single but i was never interested... he lives halfway across the country from me and i won't do long distance.
He has a new girlfriend but he still snapchats me on a regular basis.
Should i keep talking to him and give him a chance if he becomes single again? Or is he not worth my time?
Is he sleazy for continuing communication with me when he has a gf?
This guy who has a girlfriend keeps snapchatting me?
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