Proposing marriage etc

Mac

Hi ladies!!! Is it bad to give your significant other a dead line? It sounds mean in my head but i say I’m not gonna wait forever. My boyfriend and I have been together 3 years and I’m ready to get married and start a family. We have talked about it..but I don’t want to keep bringing it up over and over again. He knows what I want. What should I do or is there a different way to go about it?? SOS