Why would someone do this?

Like when we go out eat together.. he always try and have a taste of my food (which i totally dont mind, but why dont he ask beforehand?).. He just simply reach my food and eat it. Thats still ok, i can still close one eyes.. But when it comes to water.. Each of us buy 1 can of water.. He always finish his and not enough. Without a word, he take mine and pour into my cup until full, the balance he take all on himđź’€

Im scared to voice out about this to him.. It makes me wonder maybe im the one who is stingy? Even such thing i find it as a big deal🤷🏻‍♀️ I dont know. Unless y'all tell me thats normal, ok then i will just stay silent

Why would someone do this?
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