<human>: My boyfriend and I have an overall, great relationship. We are happy, moving in together, we have fun. Things are good. 

I didn't find this out through him, which in my eyes, makes things worse. I have actually specifically asked him if he has ever been to prostitutes and he said no. I know this is in his past, I also am not completely anti-prostitution if it is safe and regulated better (as in, no women forced into the business by means of trading, etc). I, too, would not want my past to be used against me. But I feel hurt that I asked and he said no. I can understand why he opted not to tell me. But I have respect for people who do uncomfortable things to maintain honesty. 

It also does not seem to have been a one time thing, but rather a sort of frequent by my standards (twice a year, for many years, when I assume he was single). I don't think he would practice unsafe sex, although I do think I had a right to know for my own sexual health as well. 
Another thing is that when we have watched porn together a lot of his choices seem to be involving a man paying for sex. It didn't bother me until my founding out about his actual paying for sex and am wondering if he still fantasizes about it AND keeps it hidden that he's played out this fantasy. 
I don't know what to do. I'm confused. 
The benefits of the relationship are aplenty. I'm happy. But this has made me really look at him with different eyes and I don't know where to go from here.

Can you give me the gist of the text in a nutshell?
<bot>: found our bf of 1,5 years has been to prostitutes in past. What can I do to put it in perspective that it IS the past? Am I wrong to be so upset by this?