Should i delete him off my buddy list?

There was this guy & we were really into each other but its totally over now and hes found another girl in like 2 weeks -_-. Sadly im not totally over with him though & everytime i try to delete his sn i keep adding him back because i miss seeing him online. I know this is a bad habit but should i just keep him on my buddy list if theres no harm to it or delete it cause its only make me think of him more?