Trouble with orgasm and s.o self esteem

Hello ladies! I am in a very happy, equal relationship, and we try to keep an even level of give and take on both our parts. I know what gets my guy going, and I can get the job done in different ways for him that he loves, but he has never been able to do the same for me. (nor have any other guys I've ever been with.) He's tried many times to make me get to that special place, but it just isn't happening! Some of the things he does feel very good and make me squirm and make my legs all shaky, but I don't ever go past about halfway to climax. I try so hard to lose myself and get loud and loose but nothing helps! As a result, my boyfriend gets very upset and it puts him in a bad mood because, as he says, he "can't make his girl cum." I've explained to him that women's bodies are complicated, and it may take a while for us to discover what works for us together in bed, and I've tried telling him that his sexual performance won't make or break our relationship! I love him for him, not his ability to pleasure me. Any advice on this matter would be greatly appreciated! Thank you!