Bf so stressed!!!

After 3 years together, my bf and I have been going through a particular rough patch this past week. It's a long story, but he felt as if he was falling out of love with me. He told me his reasons, and I knew it was just the "3 year glitch" that most if not all couples go through (he's just never been in a relationship this long, so this feeling is new to him and made him think that). We talked about it and we were pretty much all good by Saturday night and had really good days on Sunday and Monday! HOWEVER, he has finals this week Tuesday-Thursday. It's his first year of college so he is beyond stressed whenever finals comes around. When he's stressed, he always distances himself from me and doesn't really want to talk or text all week until I see him on the weekend, than everything is okay. Today, he's left me on read, barely texted me, ignored my calls, and when I finally did call at night (we always do), he wanted to make sure it was no longer than 5 mins. I completely understand just how busy and important finals are, it just kills me that after all we've went through last week that I feel as if we are spiraling back into that this week. When he texts it's like one word texts too, and I'm just not used to that because it makes it seem as if something is wrong. When we ft tonight, it was super short. I probably said 3 sentences before he told me he has to get back to doing his hw and for me to text him tomorrow. I told him like one more thing I wanted to talk about and he got upset and was rushing to hang up. Once again, I do understand how important finals are, I think it's just the way he texts and calls that really bother me. Yesterday his family booked a vacation for next week and gave my bf the decision to invite me or not, and he actually did want me to go. I'm such an overthinker that I bring myself down on days like these when I shouldn't really be. I'm working for the rest of the week, so that should keep my mind off of things for a bit until I see him Thursday. But what can I do??? I obviously can't confront him about this anytime this week, so I'm on my own. Is this even anything to be worried about?