Advice🤔

So, first off, I love my boyfriend of 2 years with my entire being. We’ve had the best 2 years of my life. However, our sex is boring as hell. Whiter than paper. Vanilla as vanilla can be. He refuses to go down on me, and when I asked why, he just said “it’s weird” and didn’t specify. We either to missionary, doggy or me on top. I mean it’s nice for a while, but things can get boring in the bedroom. I’ve tried to get him to go down on me, and I feel like he makes me feel bad for asking because he gives me this look then starts acting all weird. And then I feel bad and just say forget it. But this is a want I want so bad. I don’t know how to get across to him that I’m a woman with needs. He wants me to go down on him all the time, and I do, but never once has gone down or tried to on me. He isn’t really into toys or tying up (either of us) or blindfolding (either of us) or anything. I feel the sex flame is just blown out. Any ladies have advice on how to talk to him about this in a way he might not be so offended?