Search Results: changing a guy''s habits

The guy I've been seeing has adapted a few different habits. At first I thought that they were just an extension of his being generally uneasy with life and wanting to shake things up a bit, but a friend of mine told me that the only reason a guy changes his routine is for a girl. Not sure if that's true. Here are some of the changes:

Correspondence: He usually only uses text, but with me has gone through all sort of alternate networks to keep in touch, then informs me that he doesn't usually use all those other sources, just texting.

Eating: He's a big meat-and-potatoes guy, but with me has small quantities, lots of veggies and tea rather than coffee.

Exercise: He's started working out every day, which he wasn't doing for a long time.

Activities: He seems restless/bored with his routine and is always asking if I want company.

Reporting: He tends to tell me exactly what he's doing and where he's going to be, which has gotten me into doing the same thing, lol. I've never actually seen a guy do that on a daily basis.

We're just friends, but I like him and could see us going further. I'm just not sure if he's changing because he's developing feelings for me OR if it's just a point in his life where he has to change something and is generally restless.

Advice?

I've always heard people say that guys don't change and that you shouldn't try to change them. I'm a bit confused about this because I always thought that in a relationship the two should grow together and bring each other up and learn from each other how to be better people. My boyfriend is always telling me he's changed so much for the better because of me and he'll list of specific things. I've only tried to change some of the ways he thought about things and he's always thanked me for it. The same goes for me! He's helped me get rid of my bad habits and grow as a person. I love his constructive criticism because it allows me to grow and tells me what I need to work on and he says the same thing and asks for my advice. So I don't understand where the stereotype comes from.

Do you guys think that, in a relationship, people should accept every single flaw or help the other to become a better person and why?