Hanging out as friends

So I’ve been absolute best friends with a guy for about 7 years now and nothing more than best friends. He’s had an on and off relationship with his girlfriend and she does not like me I’m guessing from a jealousy issue. I haven’t seen him since high school and we’re in our 2nd year of college. I’d like to meet up sometime for lunch and catch up since it’s been so long but he says he can’t because of her and in someway it bothers me. Am I in the wrong?