Changing jobs

I'm changing jobs soon. Right now I work in the early morning so I'm off around 10:00am. My boyfriends schedule is flexible so we do a lot of stuff together and are together all the time. Right now our day looks like this:

Going to work and meeting up for lunch around 12:00. If we don't meet up for lunch we get together around 1:00 to do another errand. If we do go to lunch we'll usually do a different errand around 2:00-3:00. Then we are both off work. (Errands are for his work). Then we are together for the rest of the night until we go to work the next day. I don't live there yet but he asked me to move in when his roommate moves out. Which is why I need a new job that's full time and more hourly. I know that we don't need to be together all the time but I am so sad that I won't get to do things like lunch and help him with his work stuff. I'll likely be getting a 9-5 job so that will be a lot less time together.

Late December his schedule might get more flexible so he can work later (we both start around 5:00am). So maybe we can eat breakfast together and go on a walk before work. Then we can still probably meet up for lunch on my lunch break. I don't know why I'm so sad about it! Because in my head I know it's healthy to have time apart and that I need to be working full time and there are no jobs that allow me to get off around 12:00 so I'm just sad. Why am I? I think it's because I think that me changing how things are, it'll change our relationship. We've been together for 9 months.