Advice please. 5 years .. no ring . Am i the problem?

Hi everyone,
I would like some serious advice here. I have been with my boyfriend for almost 5 years(in 3 months) and I love him very much. We share a 3 year old as well. Like every relationship, we have ups and downs, but we are still together and realize that this is what we want. We live together and have lived together for about 4 years. The issue is , it doesn’t seem like marriage is near. Have I given him too many benefits and he’s comfortable with not being married? He says he wants to get married but doesn’t know when. I feel like that’s just an excuse to not do it. Would it be fair for me to move on? I struggle with feeling like if I move on that will look like I don’t love him. I do but why not get married since we are already doing life together ? Is marriage bad ? Does it change things ? What am I missing?