Stressed out boyfriend

My boyfriend has become very stressed about upcoming decisions in his life. I understand he's stressed but I feel like it's putting a strain on our relationship. I've told him countless times I want to be there for him and he wants me there as well. But the things that he used to do to show he cares and loves me almost daily have become things he doesn't do as often any more. He snaps at me more frequently and while it's often followed by countless apologies, I still notice it. I have no doubt in my mind that we are a great relationship and he truly does love me and care about me, yet these small changes in our dynamic concern me. Is this to do with me or him subtly showing he doesn't care as much, or is this the strain from stress? How do I address it as well?