I (24M) am talking to a girl (21F) on and off since May. We met in person. We started phone calling in September. She had several IOIs until my friend was interested in her too and I got insecure so I started sending cringy insecure nonsense to her (like recommending him, and sending pics of him doing goofy things when we were hanging out as a group)

She didnt respond for several days until she called me back where I think I talked it off and had her laughing in the phone call and in the end she was picking dates to see me in December for a date in person. I thought I saved it there but one week later I let her know my availability and its been 5 days and still no response from her.

Why would she pick dates to see me and then just not respond afterwards?

In the phone call I had her laughing but I do admit I swore too much too casually, talked shit about my friend (who really did try to scam me out of money and failed), and talked too much as she didnt do too much talking herself, just a little.

Any advice would be appreciated.