Second this. I went through something similar in my last relationship (great guy, no complaints other than I “felt something was missing”). It can be tough to answer to yourself what is missing, and personal therapy can help you explore that.

That being said, you also don’t need to know exactly why you feel this way or what is missing. It’s enough reason to move on if you feel like it isn’t quite right, and save both yourself and your partner some pain.

Whatever you choose, I do encourage you to explore this in therapy so you can understand yourself more — and also what drew you to your prior relationships and what you were missing in your current one (and whether this thing is a dealbreaker for you).