Questions: Relationships

So my boyfriend has a job that has him involved a lot and has crazy hours, he works hard and he seems very sharp and focus in his job. I know he can feel a little stressed at times when he is working a lot especially on his off days but he loves what he does. However I have noticed that it takes a toll on other aspects of his life with our relationship and I have noticed he is like this with his family. He tends to sometimes not fully pay attention to what is being said to him/doesn't listen, doesn't remember some things that was being said or asked him to do something. I find sometimes when I'm talking he doesn't really listen/interrupts me. He seems like his mind is elsewhere most of the time and not present. I know recently he felt burnt out and overwhelmed with what was going on with his job and tried to help him to stay present in the moment. I have always wondered if he has ADHD or if he is just overwhelmed/really stress

We have gotten closer to one another, yet our previous selves have not returned. We are developing alongside one another, but some people have realized they are just total strangers. Being married to someone who has changed over time can be unsettling. You have no idea if the two of you will grow apart or together. Change can be scary because it’s the complete unknown. I was told by the older generation you have to grow separately before you can grow together. If you don’t grow separately then it’s gonna be hard for you to grow together. Everyone doesn’t always turn out the mature one when troubles come. Live apart for a length of time before you can live together. I was always told this