AITA for being upset with my boyfriend?

I (21 F) and my bf (23 M) have been together for about 6 months. We are currently doing long distance and are both quite busy with school and other activities. I went to visit him about a month ago and ever since I feel as though our communication has gotten less and less. We used to talk on the phone several times a week and would text each other whenever we could. However, the past month he has been very minimal with texting me (like 1-2 times a day) and we have only spoken 3 times. Nothing negative happened when I went to visit him, and he hasn’t expressed anything that would’ve bothered him. Today, after not hearing from him at all, I told him how I noticed this and that it was making me worried. He quickly replied saying that he has just been super busy and hasn’t been on his phone, yet he had posted several times on different social media throughout the day. I told him it’s been stressing me out but he is saying that I am overthinking it and there’s nothing wrong. We have never had any issues/fights in our relationship so far and I just don’t really know if I was wrong to complain. AITA?