How to get him interested again

I have been with my boyfriend for 7 months now and we use to have sex all the time it was great. He was always interested, he told me what he was into and I would do it for him. We did it almost twice a day, or every other day. Back then I wouldn't let him have sex with the lights on or see me naked. Well he finally conviced me and we started to sleep naked. I sleep naked every night and enjoy being naked almost all the time I am home.

Well now he's not interested. I will dress up how he liked, lay around naked and do everything to turn him on and tease him. Well he will say ehh I am not in the mood or in an just not interested. It kills my confidence and I just don't feel good enough. He says if I get all these interesting little outfits and stuff he would habe sex with me right than ajd there. But I am to scared to do it cause its something I habe never done and I don't think I could take being rejected. When he is alone he will jack off and watch porn which is okay I understand but like why am I not enough? What can I do to get him interested. Am I too comfortable? Do I need to stop being naked or trying to tease him? He says if we add another girl he would be so down. I love him so much so I don't want this to be the end.

What am I doing wrong?