What everyone else has said, but also this: You can still catch herpes while wearing a condom. Sorry to be the bearer of that news, but herpes is not transmitted through bodily fluids. It is transmitted through skin to skin contact, so a condom can reduce the risk, but not remove it altogether. There are many myths about herpes and I am not a doctor, but I pulled this information from the internet (and checked a few pages to see if all agreed. Seems so):
1) Herpes is extremely common (one of the most common STDs/about 20% or 1 in 5 people have it)
2) Up to 80% of people who have it, do not even know they have it (asymptomatic)
3) It can be spread wthout your partner showing any symptoms at all. (Although the risk is reduced)
4) STD testing rarely routinely screen for herpes
5) It cannot be cured, but it is a manageable condition that can be treated.
Considering that up to 80% of carriers do not know they have it, due to showing no symptoms and considering STI tests often do not test for herpes and considering it is impossible to completely protect yourself from it, you can see why it is a very common STD.
I remember reading an article in which the author described a trip to the doctors for an STD test and when the doctor asked for past medical history, the person mentioned "I have herpes" and apparently the doctor said "Who doesn't" (This snippet from the article stuck in my head but I cannot find the article anymore arghh!)
Fortunately, the emotional distress and feelings of shame (due to a society telling you that you only catch stuff if you are dirty and promiscious) is the worst part about catching herpes. Herpes will not cause any major health issues, or cause damage to you, other than emotional I guess. It is largely asymptomatic (up to 80% of sufferers) and a large number of those who do suffer outbreaks often say they are mild. The outbreaks are treatable too.
Your guy should have told you before you did anything, to allow you to make a decision, or choice and that wasn't fair of him if he knew beforehand. However, I also don't think he deserves to be lynched or sentanced to a life of celibacy for this. Herpes is so incredibly common that it is highly likely that you will be exposed to it at some point during your sexual life anyway, due to how it spreads (skin to skin).
I seriously and wholeheartedly recommend doing some research into herpes. It will really help to seperate the scaremongering and shaming, from the truth (You are not dirty, it is not something only promiscious people get. It only takes one sexual experience etc) and help you understand what it is and how it works.
Hope this helps. I just wanted to help ease your mind a bit. Unfortunately most of the above info comes from online sources though (No personal experience, if I have it, I have no symptoms) and I do think you should research properly to find out what you are facing here.