How can I tell my boyfriend hasn't forgotten about me?

My boyfriend works very long hours (we’re talking 48 hour shifts sometimes), when he’s not working he’s busy with school or side jobs for friends…even going out with friends (i actually LIKE that he goes out with friends because he doesn’t get to enjoy himself that often). I know this to be true because it’s how we met ironically. When we first started dating a couple of years ago he found time to call me or send me a text during a quick break or on his way home at the end of a shift. I haven’t seen or talked to him for almost a week. This has become a pattern over the past few weeks actually. Normally I don’t mind not hearing from him or seeing him BECAUSE he’s so busy but lately I feel like I’ve been but on the back burner and it doesn’t feel good. Should I say something to him about it or just relax because he may be busier than normal.