Don't Understand

Today I talked to my friend Matt on the phone. And usually I'm happy that he calls, and I actually was initially. But there was a cold element to his voice, a distance that was almost physically painful. And then I just got angry. For no real reason I began to get mad at him, for not being around, for not calling me sooner, for not loving me as much as he used to. I had absolutely no trigger to make me feel this way except the painful distance. I love him so much that I want to be recognized by him as useful and intelligent. But it seems sometimes that I'm not, sometimes when I talk to him I feel frivolous and unnecessary. Our conversation wore out. Something it doesn't do very often. That also makes me sad; so I called another friend to see if he could cheer me up. And in the first second he did. Why do people influence my emotions so deeply and quickly? It's a good day, I have had a positive attitude all day long. What happened?