Advice

Hey y'all I'm new here and I really need some advice. So my husband and I took the plunge into the poly lifestyle last year after a lot of mutual discussion. Lately I've been feeling down and a little jealous because his girlfriend, who I've known for years and care about, and he have been trying out things that he and I have only done on a smaller scale. I expressed my interest in these things over the years, but he would always get either embarrassed or hadn't been interested in. He and I haven't had sex since October 31st 2024 and I can't tell if it's because he's not attracted to me anymore or if he's just too preoccupied with her. Ive begun to feel that he doesn't want to engage in these things because I'm his wife. She also has piercings and tattoos that I expressed interest in and he always just kind of shut them down. Has anyone been in this situation before or have anyway I can breach the conversation with him? I love my husband and he loves me, but I can't help but feel less than in some ways. Any advice is appreciated.