Breaking up

My boyfriend has obviously lost interest in me. Which really hurts, we had a wonderful thing going. But what hurts the most is that he isn’t breaking up with me (the proper way), he’s just ignoring me. He won’t pick up my call, he won’t text me. And I don’t call him multiple times, I call him once. A sit down talk would be very much appreciated. It just really surprises me because communication was always excellent. Also, we’re not teenagers, we’re in our 30s. I am so disappointed. Is there anything I should do, or consider it a done thing?