Maybe interested in someone else but says loves me need clarification😒

So any and every time my bf meets someone new good looking in my family he stares her down til we leave. I’ve had many conversations with him telling him how this makes me feel but he still does it. I watch him to see what he’s looking at he literally move his whole body and head to view these ppl and I’m just tired of it. I’m to the point like am I unattractive or am I not the one he wants like what is it? Need help please for heart and stress reassurance