I had a dream last night about this guy. I dreamed I called him and I didn't tell him who I was but he realized and we started talking. He was nice on the phone.

In real life I had a misunderstadning with this guy and I do want to call him. What could this mean?

It only means that it's on your mind and you are thinking about doing it.

I'd say that your dream is to reconcile misunderstandings with hopes that its all smoothed over.