Most Helpful Guy
In my opinion, I don't think you should dwell on the past, ex's included. If you were adamant you want to be friends and not have a romantic relationship again, I would make this VERY clear to him and if he flirts, reply in a friendly manner, but don't reciprocate his texts.
If you have done the above, maybe try no contact? If you still want to be friends, you could talk occasionally but not everyday, maybe a few times a week.
If that fails then I would no contact, wait until you're absolutely other him, when the thought of him dating someone doesn't affect you, when you stop thinking about him at all, when he takes up none of your time, mentally or physically, then, try to pursue a friendship if the opportunity arises.
The mid-point between friends and lovers is a rough place.
Just my two cents.
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