Feeling terrible now

So my BF and I had sex and he ejaculated inside me. A few days later I had this unpleasant smelling discharge and freaked out!I told him about it and now he feels so terrible about the whole thing that he can't even laugh and talk with me like how we used to. I struggled with the idea of telling him the truth and now that I have his reaction has made me regret big time. I know this isn't something he'd just brush off as nothing, but then again I can't help but feel awful about how down he is over the situation. Though everything is cleared up and back to normal, he's still very much uncomfortable just talking with me over the phone. He even said that somethings will be difficult for him to do from now on.Would you have told your SO about your 'situation'?