My boyfriend and I have been together for 3.5 years, and he's still not ready to move in together. Is this a bad sign?

Anonymous
A year into our relationship I started studying full-time and had to move in with my parents again as I could not work full-time anymore and could not afford rent. We made this decision for me to move in with my parents because I didn't want to depend on him financially, and he didn't want this either.
Even though we now lived 50km (31 miles) apart, we still made it work. It wasn't the ideal situation as we could only see each other every other weekend.

-Fast forward 2.5 years-

We're still together (been together for 3.5 years now) and the only issue we have is still the distance. I feel like our relationship hasn't been progressing like it's supposed to. There's times when we don't see each other for months, which causes arguments. I graduate at the end of this year, so I sat him down and asked him if he's finally ready to take the next step in the relationship- living together. He told me that he's not ready to live with anyone. He said that to him, moving in together and getting married are on the same level, and that he doesn't want to move in with me until he's ready to marry me. I was hurt by his response as I am sure I want to take the next step in the relationship. It made me feel like he's not as serious about me as I am about him. I explained to him that the long distance thing is doing harm to the relationship and that I dont know if the relationship will survive another year of long distance. He just replied by saying that he has made up his mind and that he won't give in to an ultimatum. He said that he won't be able to give me a time frame of when he will be ready to live with me.

I love this man a lot, but I don't know if I want to do another year of long distance.
I need advice on what I should do next because my heart is telling me to stick it out and keep making the long distance work, but my brain is telling me that the long distance is not healthy and that the relationship won't progress in a healthy way if we are not living together.
My boyfriend and I have been together for 3.5 years, and he's still not ready to move in together. Is this a bad sign?
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