Are Jill valentine and chris redfeild lovers?

I think they allude to that a little bit every now and then, especially in Resident Evil 5. But no, I don't think so, especially with the possible relationship between her and Carlos in Resident Evil 3. After the credits there's a photo of Jill and Carlos together on a Cruise after Raccoon city gets destroyed.

BUT, anyways, no one is for sure of Chris and Jill being lovers.

The developers did say that these two had feelings for each other, so I would not rule that possibility out.