confused

My boyfriend has really been wanting to try for his first child and I currently have a 5 year old and a 1 year old he's been raising my youngest since she was a baby she calls him daddy and all which makes me want to give him a baby but I don't know how to tell him the reason why I keep on pushing the idea was because I was diagnosed with herpes after I gave birth. We've always used protection so I don't have anything to worry about in have passed anything to him but how can you tell someone who wants a kids that you have a std that's not curable 😭😭