Boyfriend doesn’t go down on me anymore. Did I do something wrong?

So my bf and I have known each other for a year but we started dating around 6 months ago. I’ve never been happier, and we do have a healthy sex life. When we started having sex, it was as if everyday he wanted to go down on me and I did love it. He knew all the ways to pleasure me and I would also go down on him. I’m a pleaser myself. But for the last month in a half he’s completely stopped. Of course I still go down on him because I want to, but in the past he would ask me if he could go down on me after. Sometimes I try to give him little hints that I want him to (making out in bed and I slide his hand down my panties, wrap myself around him etc.) but it seems he’ll kind of ignore it. My friends have told me just ask him to go down on me but I don’t want to be forcing if there’s a time he doesn’t want to (is that weird?) and they also tell me I should stop giving him head if he doesn’t return the favor. Now I don’t give him head In return for it, i just enjoy pleasuring my bf ( but are they right?) I think did I do something the last time he went down on me? Is it normal for a guy to stop performing oral sex.