I think my brother doesn’t like me

I have been noticing lately how my brother acts around me and how he speaks to me, and it just screams “I don’t like you” but in a slight way, idek how to explain it, like just the way he looks at me and the grimaces he makes when I talk to him says enough. Not only that but whenever I say something he acts as if I’m attacking him and starts arguing with me for no reason at all, and since he’s my older brother (he’s 7 years older than me) I shut up to not cause problems.

One time I asked him for one of my belongings (it was some important papers he had been keeping for work purposes but they were still mine) after days of asking him to give them to me he finally did, but a while later when I needed something from said folder I released that most papers were missing, when I asked him about them he said he didn’t have them. Then when our dad asked him about them he gave them to him right away. I was so upset that he lied to me about my own belongings. Other things have happened also but my phone is lagging and I don’t want to write a whole article, but these small details are what I pay attention to because to me at least, they show much bigger things and they also what hurts the most.

The thing is, we were never like that before, unless he was hiding it, we used to play together and talk for hours and just chill together, a normal and healthy sibling relationship. It’s just that ever since he got married his behaviour towards me changed completely. I refuse to 100% put the blame on his wife as the behaviour is coming from him and not her, but I’m just mentioning the point where things started to change a lot.

I still love my brother and will never forget the times when things were good between us. But it’s just very upsetting, miserable even. It breaks my heart to pieces seeing how he treats me, it’s as if he sees me in an evil light or some shit, to the point where I start wondering if I have actually done something so bad to him for him to react that way. I’m very caring towards all my family, his wife included, despite what she has done to me (rummaging through my stuff and touching my phone and going through messages) but I haven’t even reacted or spoken to her about that, I just got very upset and moved on and decided to start a new chapter with her. If I reacted in any other way I would feel an immense sadness and guilt and it just wouldn’t help my mental health, so shutting up might be a good option for now.

What should I do? I’m afraid to ask him directly, he might react in some way, tho I’m actually planning on doing that when the right moment comes despite my fears. Do you think I have actually done something that caused him to not like me? What would you do in this situation? I just miss how things used to be. Thanks for reading.