Guy I'm dating said he might get back with his ex?

I've been dating this guy for 2-3 months and he informed me he was talking to his ex and that they might get back together if she moves into the city... He asked me about 3 weeks ago what I expected from our dynamic and said he didn't want a relationship, so I told him we couldn't keep having sex and that I'd begin dating other people. We've since gone on dated but also slept together. I have feelings for him but have been able to control them largely but this news was a bit of a shock. How do I proceed?

Guy I'm dating said he might get back with his ex?
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