I don't think it's really subservience. It sounds like that's just how you want to express you care for him. At least he is being grateful about your work. If he stops being grateful, talk to him about it, and don't do those things until he appreciates what you do. Nothing wrong with doing what you're doing unless he takes you for granted.
My gf cooks for me and I make sure to thank her each time and offer to help with dishes. She likes cooking. She is not my maid, and I don't treat her like one. I treat her like the very special person she is. I do things for her too like fix things around her house, help her with yard work, etc.
If my gf picked out clothes for me to wear, I would draw the line on that one and we'd have a talk. It's about what YOU are comfortable with. But also remember, you are setting a precedent. Is he able to cook and clean for himself? Or he just doesn't want to?
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
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