Knowing you love him but something feels off what should I do?

I love my boyfriend and I still want to be engaged to him, but sometimes it feels like the love is less. My reasons being because when we talk he thinks that I am taking it out on him and I am not. I just want to vent. I don't think he understands that. How can I show him that I just want a guy to talk with and who will listen before speaking. Any advice? What should I do,