<human>: Me and let's call him John dated for over three years, before breaking it off due to long distance troubles. I proceeded to get into another long term relationship, which did not work out, meanwhile John remained single.

Now, John and I have been talking again, and I'm planning to move to his city to avoid long distance. This is NOT a should I/should I not get back with my ex discussion. We care about each other deeply and both think we want to get back with each other/end up together in the long term (i.e. marriage).

The problem is that I am not ready for a serious relationship yet (as mentioned, I haven't been single for very long and want to be able to hook up with other people). However, John is ready for a relationship and posed an ultimatum to me: either I don't hook up with other people and get into a relationship with him OR he will not talk to me at all. I don't want to lose him; I want to hang out with him in order to determine if/when I'm ready to be his gf, but can't do that if he refuses to talk to me. On the other hand, I'm not ready to give up my independence and don't want to be forced into a relationship I'm not ready for. 

Thoughts/advice? I feel like I'm in a lose-lose situation here.

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<bot>: Guy I've been "talking to" posed ultimatum: get into serious relationship or break it off completely. I would prefer keeping an open/casual relationship (for now) but don't want to lose him.