told me he wanted to get engaged

My boyfriend of four years told me he was going to propose this week and didn't (and he left to go back home). I'm feeling pretty disappointed and like it will never happen at this point. We're long distance right now and I won't see him again until the summer when the long distance ends. I feel stupid for thinking he'd actually do it. Do I have a right to bring this up with him or should I just let it go?

(Before anyone accuses me of pressuring him to propose in the comments, I did not and he told me this information all on his own back in January. I was so excited.)