<human>: Summarize the given text in a few sentences.

My boyfriend has always had a temper which he is aware of and has been working on by changing the way he thinks about, and therefore reacts to, a situation. It has improved throughout our 2.5 year relationship, and his family members have commented that he seems much more calm with me. He has told me that his anger issues were much worse as a young teen but dramatically improved in his late teens/early twenties.

That being said, he still does sometimes get frustrated and immediately reacts with physical violence towards inanimate objects. If he is trying to do something on his cell phone and it's not working, he'll throw it against a wall in a fit of frustration. If a cupboard door is open and he stands up and hit his head on it, he'll slam the cupboard door closed. Once time I ACCIDENTALLY closed a door in his face, breaking his glasses. He punched a hole in the door.

After these episodes he'll return to normal within a few minutes. He tells me that these reactions are completely knee-jerk and happen before he has time to process his emotions.

It still freaks me out. I've told him that I don't like it, even though it's a knee-jerk reaction. It makes me feel stressed and unsafe. He always feels bad that he made me feel that way and apologizes. He fixed my door. He did say that he would work on it, but that it really is something instantaneous and difficult to control.

For what it's worth, he's never even come remotely close to being violent with me, or even raised his voice at me. Whenever we disagree it's always rational and civilized.

I'm just not sure if I should be worried about his occasional physical reactions to anger. Is this something men experience due to testosterone? Is it indicative of a bigger problem? Should I tell him he needs to stop reacting that way if he wants to be with me? Or is this something I should let slide? I have no father figure, brothers, or close male friends, and he is my first boyfriend, so sometimes I have trouble figuring out what's inappropriate and what's just a guy thing.
<bot>: Boyfriend sometimes throws/hits inanimate objects when angry, but the moment passes quickly and he is working on his anger issues. Should I be concerned or let it slide?