Need relationship advice.

Hello everyone, I'm new in this subreddit. I'm in desperate need of an advice... My boyfriend and I have been together for over 5 years, all through college. He's a few years older than me, but we both studied in the same city, where I live with my mom. Recently, he started working ... and I feel like everything has changed. Basically, these past few years were all about me and him. We grew up a lot together, and especially I did, he turned me into a new person... making me feel beautiful, happy, confident and good in my own skin. I was happy and I really didn't feel like I needed anything else besides him. But now, everything has changed. We never spent that much time together (probably 3 days a week?) because he leaves in another town, but I knew that every time I'd need him he was there, I could just call him or text him... now it's not like that anymore. He isn't only my lover, he's also my best friend ... so I'm used to texting him about anything, but now I can't because he says that he's working and it distracts him. I know that this is normal, and it's the natural process of growing up, but I just feel like we're starting to lose that special + unbreakable bond that we had. He works over 12 hours a day, and he stays at my place some nights, but sometimes I even feel like he stays at my house because it's convenient for him. (I live 15 minutes from the place he works, he lives over an hour away) and it's starting to annoy me how he isn't even looking for a house. My house is not a hotel, I live with my mom, he can't expect to stay here forever! And every time I try to bring it up he always says stuff like "if you don't want me to stay with you just say so and I'll go back to my house". I don't think he understands what I'm going through right now, how much I'm hurting & how lonely I feel... every time I try to bring it up he just acts like I'm an immature child and I can't expect him not to work, which is not what I want. But I want to build a life together, how can we do that when we are always apart, and then the times that we we are together he's always too tired / too stressed to enjoy the moment? (he denies this, but it's true). His job doesn't even pay him a lot of money, so it's not like it's worth it. He just says he's out of options at the moment... but I know he's not; he's the smartest person I know, and I'd love to see him do something that he likes and that he repays all the effort he put into his studies and into what he does. He doesn't realize how much I miss him all day long, he says he misses me too... but he's so busy working I doubt he actually means it when he says it. Our sex life is also terrible at the moment, it's never been that great unfortunately, but it's pretty much non existent at the moment. I feel lost and I don't know what I should do with my life or get him to understand how bad it is for me. A friend of mine, who went through a similar situation a few years ago, says I should start doing my own thing. But the truth is that it scares me, I never thought we'd be one of those couples where everyone does their own thing and then tells each other about their day at night. There's nothing wrong with it, I just never thought that would be us... and I'm honestly not ready to let go. I'm going through a really hard time right now, I'm sad all day and very unmotivated to do anything. Thanks for reading!