What's a healthy way to handle things once you start devaluing someone???

I've been dating a guy the past month and he seemed great, until I suddenly noticed the way that, aside from a perfunctory "how was your day", he expresses ZERO interest in me or my life. Not only does he avoid asking me questions about myself, but he actively changes the subject whenever I mention something about my job or my friends. (There are some other behaviors that've demonstrated that he doesn't GAF about my basic well-being.) Talking to him is so boring and one-sided.

I know that ideally I should bring this up to him when we hang out, but the idea of seeing him sounds like a chore. This sounds so bad, and I feel like a jerk saying it, but I just don't see the value of spending time with him. We've only gone out for a few weeks, so how much of an explanation do I really owe here?

I can't tell if this is a normal reaction to a poor conversationalist, or if this is my BPD telling me to jump ship. Advice is welcome.