Why is my male best friend suddenly acting like a jealous boyfriend?

no one seems to able to answer this for me, but this behavior was WAAYYYY out the left field. Context: Me, a 34 y/o woman, and my best make friend, a 45 year old male have been best friends for many years, and he even made it clear to me he never wanted a relationship, this last week I went to Georgia, the state I'm from, after living in Ohio for 4 years, I was getting home sick so I wanted to visit. We share an apartment, and do things together every day, but tonight when I called him, he acted in a way I have NEVER EVER seen before, like a jealous boyfriend, it confused me so badly, he's accused me of lying about reasons for being on my trip, for some weird reason, even though I haven't lied to him, and also acted very weird about me getting stuff I have never worn before because of low self esteem, he even started asking "who are YOU wearing that for?" or even got nasty because I couldn't answer the phone when he called the first time because I was IN THE BATHROOM. He said "You're in a hotel doing nothing, there is no reason you can't answer my call" I ended up having to explain things that I shouldn't to him It breaks my heart and I'm confused. Why is he acting this way, out of NOWHERE? Also not the first time I came down, and he was fine the first time, what is happening? please help, no one else tried to help me get an answer and I am sad and confused. Sorry about my messy question, Im not good at long details

Why is my male best friend suddenly acting like a jealous boyfriend?
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