My partner and I have been together for over a year, how do I know he wants to marry me?

He was in a relationship for 7 years, three years, before we dated. He told me that he didn't love her but he was ready to commit to a lifelong commitment. Now that I think about it, is that how he and I will go? Our relationship is very different than the one he was previously in. But, I don't know if he sees me in the long run. He's always said, "when we get a house" or "whenever we get married". But he's not ready to commit like that, yet. We're both not honestly. I just know that if he didn't see us long term, he would've ended things. But is that true?

My partner and I have been together for over a year, how do I know he wants to marry me?
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