I finally meet someone I love, and they were just using me

I really shouldn’t be this distraught over it. The relationship lasted four days, but god it felt like it would go on forever. He was so sweet, and cuddly, and kind. He listened to the things he said, he’d comfort me when I needed, if I wasn’t 17 and he wasn’t 20 we’d be soulmates. We were an online relationship, so I never saw his face, but neither of us never asked how old the other was. And it just hurts so much, you know? When I was with him, the world felt right. I felt like that was how life was meant to feel, like everything made sense, but it was all a lie.