How do you break up with someone you dont want to hurt?

So my gf and I have been dating for 5 years and 4 months. Part way into our 4th (going on 5th) year dating she still wasnt interested in getting married (a ‘not yet but someday’ situation). I decided to give it another year while at the same time preparing myself for if nothing changed and needing to break up with her. About 6 months into that she lost her job and I was supporting the both of us (we had been living together for a little more than a year at this point). All of a sudden she seemed really interested in the idea of marriage when she was suddenly dependent on me. I put off making the decision because I do care for her, and I wasn’t and I’m still not unhappy spending time with her.

She got another job but it didn’t pay well so she was still quite dependent on me. Now I just got a new job and I have to move for work, so she will be staying with her parents until I find a place, but even when I do her commute to her job would have been over 2 hours. But she lost her job again so now she will be home w no job, she is really at a low point in her life.

So here is my problem: The time at which I had picked to make a decision is coming up and I just really don’t think that it is going to work out between us because of the distance and her not being interested in getting married (I still don’t think she wants to get married for real, it was just as a result of her suddenly having to depend on my so completely).

The problem is I still care for her but I also want to get married, I don’t want to leave her at her darkest time…. So what should I do?