How do you reconnect with someone?

Growing up my (23m) cousin (24m) and I were really close, we’d make jokes, go on adventures and have each other’s back no matter how wrong the other was. I was an only child and he lost his mom to cancer around 5 and was raised by my grandparents and somewhat by his dad in his later teens. He’s the closet thing I’ve ever had to a brother, he’s not the brightest but he was always fun to be around. At school assembly’s during spirit week he’s stand on a chair blowing air horns and hollering. He’s that annoyingly obnoxious person on a sitcom who you always find yourself rooting for. Growing up he wanted to join the marines and when he hit 19 he did, I feel like that’s when I lost him. He came back and our conversations felt strained, he had this sense of mild superiority over me and would say he would guard me and the family and stuff about duty. When our grandpa died last year I was the first person he hugged and leaned on, I held it together (when I really wanted to fall apart) to be there for him. Went to the bathroom for a solid 20min just weeping and slapped myself a couple of times to get it together. I did my best to be there and take care of my grandma, mother, and my cousin. I really thought we’d come closer together after this tragedy but he became distant again when he left. A few days after the funeral he was over at my parents house he was eating with my grandma and my little sister (she’s 3, it’s a long story) and I decided to take a picture of them eating together since its been years from the last photo. Sent it to him last month saying their grumpy faces are genetic (we’ve always joked like this before) and he did not respond well to it, stating “ I wonder why we looked grumpy”. It’s radio silence again and I feel like I really fkd up