I love a guy but he has a gf. I know he feels the same way. What should I do?

This isthe first time i've liked a guy for his personality and not looks. We have soo much in common and we click. He knows everything about me and he's deepened my faith in Christ. But he had a girlfriend and doesn't talk to me when she's around. She's playing him and is only dating him to make Er ex jealous but yet he's in denial. I love him and I know he feels the same way. What should I do? NOOO HATERS PLEASE!!