Back with an ex is this good idea?

I split with my ex of 5 years 2 years ago he was quite controlling narcissist and angry. This year he saw me with a bloke and he then started messaging me begging me to speak to him saying he had changed etc. So I did. We've been seeing each other since May but his family don't know neither does his friends we've been on holiday but he lies to everyone about who he went with. He said we r taking it slow. He calls me every day for hours. He calls other girls babe he doesn't call me that. When I asked him why he does he said its habit and does it to every woman but it makes me feel invalidated and not good enough. Am I wasting my time with him again? Something pulls me back to him but he won't ever be able to offer me anything but why can't I say no is it because of his narcissist behaviour?

Back with an ex is this good idea?
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