Sometimes you need a clean break or no contact for a while. No toes in the water in this situation, you are in or out. The ex might be simply wanting to keep doors open for his advantage. You probably see a slow escalation of favors.
And not having a clean break can mess up future relationships. The new significant other will not appreciate old doors being left open. Are you in or out. This will be a point of contention. The alkie/addict here has tried that and when he comes around with his ex(oh we're just friends now helping each other) her demeanor is completely different than when they were officially together-it's a cross between dread & caution.
You don't want to have to deal with a work in progress especially if there were existing issues.
Stay safe, Good Luck