It sounds like he refuses to take responsibility to me.

The reason it sounds like excuses is because he is not even validating your right to emotion.

If he said: "I'm sorry if I upset you, it's important to me that you don't feel that way. From my perspective the reason I ___A____ is because ____B____, and not an indication that I don't care, but it sounds like I'm not communicating that well. What is it that made you feel I don't care? It's better I understand so I don't upset you in the future..."

Etc.

If that's not what he was doing then it's not effective.

The other possibility, to play devil's advocate, would be that you are asking for reassurance over and above what it is possible to give. I only say this because I have a friend like that and in all honesty I eventually started to avoid her because I was sick of reassuring her (but that was also accompanied by the fact she doesn't really give anything back to the friendship). I can't really think of an example right this second of what that looks like...but it's probably not the case anyway.