If he's a Turk, he's likely to be Sunni. A lot of Turks are secularized and as Sunni Turks, they tend to be less fervent in their religion; but, it sounds like he's going through a more religious phase in life. Perhaps its due to separation from his culture--the religion helps him find a tie. I know several Turkish Sunnis who are very secularized who eat pork (secretly) and drink alcohol (not so secretly).
Also realize the way the dhimmi are viewed and then those viewed as heathens. The dhimmi are non-Muslim but religious subjects (tend to be People of the Book) who are afforded some rights. The heathens are seen to have no rights.
How does this impact you? If he has relations with you and you are seen as heathen, his only fault lies in having dirtied himself. His culture would not dictate a sense of guilt for hurting you because you are not much better than an animal.
Okay, the most extreme case is in the earlier paragraph. How does it play out in the average case? A pursuit of the non-Turk/non-Muslim is a lurid pleasure since it isn't seen as anything more than fun with an object of desire. There would be no real future and no repercussion for him unless it was something that could be real--in other words, you convert to Islam or you happen to be of the same culture as himself.
So, since it is just fun, dating etc. be aware of how each party approaches the relationship, to include sex, etc.