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Someone leaving you is them saying "Sorry but despite you and all your qualities, I don't want you, I'd rather find someone else and try my luck somewhere else". Do you not see how silly it is to go back to someone like that? You contacting him is you saying despite how low worth you were to him, you're going to crawl back, be desperate and will grab any breadcrumb he throws at you. If he really wants you, he'll contact you and find a way to be with you. You should never make the first move as the person who was dumped. This literally just reeks desperation and that is not attractive. I know it hurts but reaching out won't make you feel better and will just make you look like the girl who can't take no for a answer. Whether he misses you or not is irrelevant because he left you. Therefore, he can't be missing you so much if he hasn't felt the need to talk to you.
Try to hang in there, be good to yourself and delete his number. The temptation will just linger.