"I'm the one that is supposed to be taking care of you."
"I'm the one that should be doing you a favour."
"I'm the one that is supposed to be taking care of you."
"I'm the one that is supposed to be ~" 「〜のは私の方なのに」
"taking care of you" 「お世話になる」
"I'm the one that should be doing you a favour."
"I'm the one that should be ~" 「〜のは私の方なのに」
"doing you a favour” 「「お世話になる」
"taking care of you"
"doing you a favour" の代わりに
"looking after you" も使えます。