Am I wrong to leave after 3 years and no discussion of marriage that was discussed before dating is being cared about?

My boyfriend and I have will have been together for 3 years as of next spring. I was very honest with him before making it official in our relationship that I am looking for marriage down the line and ideally within 3-3.5 years of dating someone I feel you should know and at least be engaged. Unless you’re just wasting time. He discussed with me that he feels we should live with one another to fully see …. which I can understand that piece so next fall will be 2 years of living together.
Things that I’m assuming should have happened didn’t such as knowing my ring size, going ring shopping, or asking what I may be into etc.
My girlfriends and I have talked and I’ve been stressed as no discussion of marriage or anything he has said and I refuse to be the nagger for a shut up ring or in general and that means for me sticking to my guns and leaving. He’s ok with more children before marriage and that’s not what I’m looking for honestly he has an 18 year old, he’s 40. I turn 30 soon and don’t want to waste my time if I’m not getting what I discussed Before being in a relationship. I love him I just feel sad that he may not be my person.
Am I wrong to leave after 3 years and no discussion of marriage that was discussed before dating is being cared about?
Post Opinion