Guilt Over better sex outside the relationship

I'm (27f) in a sexually open relationship with my boyfriend, and lately, I’ve been feeling guilty. The sex I’m having has been more physically satisfying than with my bf.

When we first opened up our relationship, I thought I’d enjoy the variety and excitement of being with other people, but I didn’t realize how much I'd enjoy the physical differences.

What makes it even harder is that I do really care for my boyfriend, and we’ve always had a good sex life, but recently, I’ve noticed that when we’re intimate, it just doesn’t feel the same. . It feels good, dont get me wrong. And there's more intimacy with him. It just isn't as fulfilling as it used to be.

My boyfriend has never asked about the details of my encounters before, but recently, I’ve noticed he’s been asking more questions about my experiences—especially after I come back from seeing someone else. He's seen the types of guys I'm meeting and I can tell he’s starting to sense that I’m getting something out of these other experiences that I’m not getting with him. It’s been making me feel really guilty because I don’t want to hurt him,

I feel conflicted because I don’t want to feel this way. I love him, and I want to be fair, but at the same time, I can’t deny how incredible the sex has been with others. It’s like an addiction to the physical sensation, and I don’t know how to navigate these feelings.

How do you handle when sex is betters outside the relationship than in?