first phone call from my ex...

it's been 6 days since I moved out and over two weeks since our break up.
She called me today twice. I didn't pick up of course, then she txted me asking if I can help her get a mattress from our mutual friends.
I knew she didn't call because she missed me, she's still with a rebound (long distance now lol).

I sent her a text telling her that I don't mind talking to her in the future but now I need time for myself. I also told her she can have my car tomorrow if she needs it from noon till 4. (obviously, I'd just leave the key in the car, without seeing her)

Do you guys think it was a mistake sending her a text? I wanted to let her know that she can't count on me whenever she needs me without being totally rude by not replying to her text.

She obviously wants to have me around when she needs me and I wanted to show her it's not gonna happen. I'd let her use the car because she helped me move.