I was just petting my horse and he had a very kind expression and out of nowhere he pins his ears and tries to bite me ! I just got him a couple days ago and I'm wondering if he is bipolar ?

I had the exact same problem with my horse but he was nasty all around to deal with it takes time for them to adjust to a new person my advice reward good behaviour but not by hand also try ground work free lunging with a lung whip and let them come to you it's a Singh of respect and it helps build a good relationship with you and your house
When horses feel uncomfortable in a situation they will bite or run maybe even strike out but you have only had him for a few days so just take the time to stand by the fence or the stall for a little bit and let him get used to you being around
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