Search Results: worried about his past

Yesterday night we went to watch a movie and then we would walk around and then go back to his car. I've had the urge to tell him something I did before we got serious (i. e. when we just started seeing each other). I was going to tell him earlier but I was too scared to tell him. So 7 months later (together for 7 months now), I told him the truth. I told him that when we first started seeing each other, I was seeing him and this other guy. And I kissed both of them on the same day. He got quite pissed off but more upset. He said "why didn't u tell me this before? I wouldn't have pursued this relationship. How could u do that? I know its the past and now its too late because i love you and i dont want to let you go. But tell me everything right now because i dont want u to bring anything else up next time. If u do, i can't take it anymore and im probably going to break up with u." But then i told him "thats it. I promise" and then he would pull me to him and he would hug and kiss me.
I feel so terrible telling him that. If it was the other way around and he told me this, i would be so furious with him.
And when he dropped me home, he didn't call to say goodnight like he usually did (but he told me he was really tired) and today he didn't message me good morning like he usually does as well. Im getting so worried.. i mean he still kissed me last night (we made out) so should I still be worried? Should I have kept this to myself and not tell him?