is it always good to stay silent!!

I recently had a major fight with a close friend of mine (also my flatmate) over some plans I had made for myself and he ruined it for me. I was supposed to work all morning thru this week so that I could work at another place or take complete rest cause I realized I had been over working myself in the last few weeks.

During the fight I said too much and told him off for him being irresponsible towards work and blah blah blah..I came back home and realized I had said too much and pondered over apologizing. Lets see I will probably say sorry and get over with it.