I'm tired of waiting for my bf to propose. Please help?

I've been with my boyfriend for over 2 years. He has told me since the beginning that he knows that I am the one for him and that he is sure that he doesn't want to be with anyone else. He treats me good and everything has been fine but lately I've been asking myself why he hasn't proposed. He has mentioned in the past that he wants to marry me and have a family, but hasn't made the effort to show me he's more serious about me. Could it be that he is just comfortable with me an doesn't see the rush to get married? I have been there for him through literally everything like family members being sick, when he went to school, and his struggle to leave his parents house and buy a house. No matter what I was always there for him am he acknowledges it. He always tells his friends and me how much he appreciates that I've always been there for him. I always do everything for him and show him how much I care and love him. Wouldn't that be enough to motivate him to want to propose atleast? He keeps saying how he wants to buy a house and I just feel like I'm not a priority. It's been a year and he's not able to find one. If he really cared, even renting an apartment to be with me would be enough right? I feel that him saying it's because he hasn't found a house yet, is an excuse. I truley support his plans to buy a house but how does that stop him or interfere with him proposing to me? I'm not sure if he's serious about me or what I need to do to show him that I need to more than just his girlfriend now. I don't want to waste my time and want to be assured that he is serious with me. I feel like I am all about him but not sure if it's the same way back. Please help!
I'm tired of waiting for my bf to propose. Please help?
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