I'd say he's enjoying his time with you for the sex. He's not interested in a relationship nor does he want you to be with anyone else. If you're having unprotected sex, despite your age, you can still get pregnant. He doesn't seem to care, either. Who's calling all the shots? The love comment is to keep you hooked and vulnerable.

It's your responsibility to protect yourself, particularly during ovulation. Don't blame him for having consensual sex in the middle of your ovulation. It is you who is playing with fire.