My boyfriend keeps saying thank you, and I didn't even do anything

So, my boyfriend (22 M) keeps thanking me (19 F), and I don't know why. Like, we'll just be texting and the conversation will naturally die down, and then ask if a sudden, my boyfriend says "Thank you". And then I'll ask him for what, and he'll respond with "being you". What does this mean? I haven't done anything to deserve a thank you! I'm confused. Does he secretly want me to do more of something? How do I ask him what more he wants me to do? I don't know what he means, I feel like I'm stupid for not knowing what he means, I just don't understand though!