Boyfriend is regularly taking hours to reply and isn’t acting as attentive as before?

I started dating a guy I like. At the start he was really attentive and texted a lot for about the first month. However, he is starting to take longer and longer to text ( he checks his phone fairly often when I’m with him so I know he looks), it takes him hours to reply. He’s also stopped being so verbally attentive and less warm towards me. I feel kinda sad about this and asked and he said that he just is working a lot on his final project for college. However it just feels like something has changed with him. What do you guys think?
Boyfriend is regularly taking hours to reply and isn’t acting as attentive as before?
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