it seems to me that Zoey is causing some overreaction
it is not a suspended relationship, it was a choice MC never regretted (his words) because he knew he did not love her.
he did not want to follow her because he preferred to study, he stopped contacting her because they had nothing more to say to each other and everyone was going on with his life
6 months of silence are a tangible sign of indifference.
Zoey is not even an ex in the strictest sense of the word, that returning has not even contacted MC directly, but has just passed by his house to see if he was there
then it is 100% sure that there will be the possibility of having sex with her, but if anything that will be the "big" problem, not her return
I would be much more concerned about being a customer of the restaurant and who we fucked, that in BR are all relatives