My ex-boyfriend's brother

When I was 25 years old, I told my ex-bf's brother that i feel so old. He laughed, and said - we're a quarter of a century old; we're not that old. He was my age, and surprisingly, I felt like I've known him forever. He seems to understand me, and I understand him pretty well too. When we talk about something, we don't need to explain a lot. When I met him for the first time, i immediately felt the difference of being able to talk to someone who is on the same level as me. And I felt some regret of having his brother as my boyfriend then. Not because I would have preferred him, but because I could have met people like him, and not stuck in a relationship I was so disappointed in.