Distancing or working on us?

My boyfriend and I have been dating for 3 years now and I am almost done with my undergraduate degree. He’s been done with his and is working really hard to get out of debt and student loans. He just picked up a second job and I also have two jobs while going to school full time. We want to be together but I am scared we will start growing to busy for one another. We both make time for one another whenever we can but sometimes we don’t call each other when we are heading to work or if we are really busy we won’t talk until 6. Have you experienced this or are we really growing apart because of the lack of time?