Feelings

So I have been dating this guy for 5 months. He loves me a lot and I just don't feel as strongly towards him. He is my first Everything and I just don't want to lose that. He is such a great guy and I really honestly thought we would make it. I told him that he deserved someone that would love him the same as he did but he said he'd never move on. I just don't know what I'm feeling. Should I end it or keep trying?