I guess I often guess and feel very selfless, but sometimes I still think I do that to avoid pain or conflict, or because there's something to get. I do however often feel genuinely guilty when someone's mad at me, even if I'm 'objectively' not the one to blame. I then do apologize/make amends just to get over the guilt, whether it was justified or not. 

On the other hand, I feel like everything I do, even if it seems selfless at first, is for my self interest.