Any addict can relapse in their future. It's a risk to be with an addict, and only you can decide if that is a risk you can take.
My recommendation would be to ignore all words and always watch actions, that is what matters. To be honest, six months of being clean is not a very long time. To him it is, but the big picture? No. No one wants to hear it, but time will always tell.
In the mean time, I would follow your own gut and what it's telling you is right for you. Take good care of yourself and keep the focus on YOU.