No ofc I let him talk. I have caught myself completing his sentence when like you said we both are speaking on the same topic and yk how you just complete the sentence in agreement. Like that. I would nod my head and then complete it but i wanted to know about completing his sentence when ik what he's talking about and he's stuck but it's not a natural completion. I figured I'll do it only if he looks at me mid-sentence. Idk if it's okay to do so. But thank you so much for all this advice, it helps with the little things and avoids my overthinking.