Having a sensitive boyfriend??

I'm going to be honest here: I honestly don't know how to react in many social situations, but I do my best and keep my head up.

The worst for me are situations when others are hurt or crying. I have no idea how to react.

Which bring me to today. I am driving home from work and have a flat tire. I call my boyfriend and ask him to come pick me up. He tells me that he can change my tire, and I am a little surprised. My boyfriend is the nurturing and geeky type. I don't see him being able to fix anything. I understand that seeing him this way is a fault of my own, as he is actually a very handy man. He built his own deck with Koi pond. I just usually see him building computers instead of cars.

Anyway, he can't get the jack out of his car and is pretty flustered. My best friends fiancé is a mechanic, and I suggest we go to him for help. This makes him angry. He doesn't tell me it makes him angry, but I can see in his face that his ego has been damaged. We end up going to the friend, and I can tell he is upset.

I don't know how to comfort him. I feel like saying "Jeff fixes cars and you fix other things. If Jeff has a broken computer, he would come to you." But I don't know if that would be an acceptable response.

But, one of his faults is that he gets a sore ego fairly often. It is a little exhausting having to think of ways to make him feel better. How can I explain to him that not everyone is perfect at everything without being a jerk about it?

Does anyone else have an SO that is sensitive about this sort of thing?