sexual peer pressure...

So about a month ago one of my good friends kept asking me to suck his dick over and over again for about an hour, I was saying no, no every time he would ask me, and I told my boyfriend.. and he said it seemed like I wanted to do it.. which isn't true I didn't want to do it.. I felt pressured and I don't know how to explain it to him to make him understand and how it felt for me to be there... what do I say to him that will make him understand..