You're very critical of your brother!
Me and my younger brother are really different in terms of our interests (almost polar opposite), and at times growing up we didn't like each other much. Outside of special events, we don't talk and tend to drift a bit. He has his long-term girlfriend, his work and hobbies. I have my career. It's normal for our relationship that we don't talk much, but I'll ask mum how he's doing and probably vice versa.
I'd consider us to be really close and I love seeing him at birthdays and Christmas. But life has moved on, and we live far away, so we don't keep up.
Now, he's always been laidback and shy. So I could have blamed him for this lapse in contact. I could pick apart his dyslexia, the fact that I achieved far more highly in school than him. I could analyse the fact that if I Whatsapp him a funny photo, I might get a reply, and assume he's got a chip on his shoulder about me. I could pick and pick and pick until I found a narrative that "explained" it all. Or I could accept him as he is.
If the day comes that my little brother doesn't attend my wedding, I will go round and ask him why if it bothers me. And I would likely be heartbroken. But you've never asked the question and are concocting fantasies in your head about another person, instead of dealing with the actual problem.
What does it even matter if he's jealous of you? Is it your business that he once flashed a wanker sign at someone? Does that say something about "him" as a person?
Even when he's sending photos of his own child, he's doing something wrong - it's because he's insecure, seeking approval. Something negative. Not just sharing pictures of his children.
You resent talking to him because he never asks about you. Some of my friends are bad at that. Some people are just a bit shit at communicating. To then decide that his lack of interest in you is because you went to uni, is presumptuous and a little arrogant.
Also, have you considered that he might be 100% up to speed with your life because he spends so much time with your parents?
I do find your posting style very odd. It's almost a patronising, faux-concern about your brother who, to be honest, just seems like an uncomplicated man living his life, not someone crying out for help.