Did I really mess things up with my ex and lose all respect?

My ex and I were are in a weird spot 1 week out from an amicable breakup (i agree with the breakup but feel if the issues I brought to the table could be resolved I would try again). Until today things were on extremely good terms, to the point she had said more or less said she was still in love with me which I didn't think was the case immediately after the breakup.

Yesterday I sent her a message that looked like it was meant to go to someone else and said i sent it her by accident - after meeting with my therapist I realize this was highly manipulative. I think I just was trying to have an excuse to start a conversation. I can be very impulsive. I happened to send something I actually was going to send someone else and she asked if the message was referring to her and I said yes. Anyways we talked and It was kind of pointless and confusing and left a bad impression. She then asked me later that night if I sent it on purpose and I lied then called her and said I did after she said she trusted me. Then we talked for a bit and I impulsively said I loved you, cursed and hung up the phone when saying goodbye. I texted, sorry bad habit. But never got a response

I feel like I need some indefinite no contact and don't know how when I know her number by heart. I feel like a fucking moron and like I undid all the goodwill from how mature I had been previously (something she commented on earlier). Did I lose all respect from her?

Edit: I also want to add, any advice on how to regulate emotions and acting impulsively would be appreciated. And also should I apologize? After giving space of course, or just let it lie and not do it again
Did I really mess things up with my ex and lose all respect?
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