Hemroids in a relationship

So ever since I was young I’ve had flare ups of hemroids but as I’m older (only 20) they seem to get worse and more painful. They are super uncomfortable and I hate having to live with them and act like nothing is bothering me. Obviously it is very embarrassing and I’d rather not talk to people about it, especially my bf. We have been together 3 years, but I just don’t know how to tell him. We have had sex when I have had a flare up and he didn’t say anything idk if he noticed but sometime I really don’t want to have sex or move much because I’m in pain, but I’m so embarrassed I don’t want to say anything. Please help 😖 how do I tell my bf about my hemroids ?!