Is this behavior considered toxic in any way?

PurpleStarGirl

This is just a question about baffling behavior I witnessed tonight regarding a close friend of mine. My friend (48M) is "dating" his ex-girlfriend (45F) that he was with for a good year and a half a few years ago and tried dating again a few months ago. She seems to think they are in a relationship again and are exclusive while he's flat out told me that he's just seeing where things go and if she can respect his boundaries.

Earlier he had to stop drinking and hanging out because she told him it was time for him to go home. And got into an argument with him where he was right on a subject I even had to look up because the argument between them was ridiculous and she was adamant he was wrong (Spoiler: he was correct). As we were leaving because he kindly gave me a ride home, she made him change his music in his vehicle that he was driving because she didn't like the band. She also told me (33F) earlier that he was toxic. I kind of shrugged because everyone has toxic traits to a degree. But if he's supposedly toxic, then why are you wanting to get back together with him? For the record, she decided to want to get back together with him a week ago.

Honestly I'm just baffled by this. She's a nice person but I see a small amount of red flags regarding her and my friend. I'm just gonna support him in whatever because he's my friend and that's what friends are for. I'll be there if they decide to be serious and I'll be there if he ultimately decides she hasn't changed and decides it's not worth pursuing any further.

Are those little behaviors considered toxic at all? I'm asking because it will be likely I'll be hanging out with both of them even more considering I hang out with him and I want to watch out for stuff like that so I can protect myself or at least be supportive regarding my friend.

Is this behavior considered toxic in any way?
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