Friends with a sex offender .

So I just recently learned that a guy I'm friends with and work with is a third level sex offender . I would have never guessed or thought that he has done anything like that. To make matters worst, he's friends with my bf. Apparently my bf has known about this for a few weeks now. I'm not sure if I'm over reacting but even though my bf and I don't have kids I don't want him back at our apartment . What pissed me off even more about everything was that my bf was trying to take up for him. Online it says he's a level 3 sex offender. Level 1 being low risk so I think I am well within my boundaries to be worried. Apparently he was "drunk." But he swears that he's not that person anymore. My thing is, being drunk doesn't alter your morals .   I am mortified by the whole thing and even more furious at my bf for trying to make it seem like it's not a big deal . To me it is .  Plus it happened 5 years ago. I just can't .   Update : I went on the registry for sex  offenders and it said the girls ages were 12 and 9 at the time . Personally just looking at it. Made me feel sick I don't think I could bare to hear the story .