My boyfriend (33M) hasn't proposed to me (29F) after being together for six years. How should I proceed?

My boyfriend and I have been dating for more than six years and have lived together for five years. Around the five year mark, I started bring up next steps, i.e. a proposal. I said I'd really like it to happen in the next year because I want to make sure we are moving in the right direction.

My boyfriend said he was planning to propose on an international trip we had this past summer but in June I began to worry because there was no planning taking place. By the time he got around to it, it was too late to order a ring, etc.

Then, he said it was going to happen domestically this month. That's also not happening as I am leaving for a work trip in a few days then spending the holidays with my family. I also know no ring has been secured.

So now he's talking about a trip in January or February where he might do it. Because of the past two disappointments, I feel like I am always nagging him about it. It feels like it's not even special or a surprise. I also feel like of I want it to happen, I'll have to plan it myself ...which defeats the purpose because I want it to be meaningful. Every time I tell him how sad this has made me, he takes it seriously in the moment but there are no tangible actions taken.

At this point, I am scared that it is never going to happen and I'll need to start over. Any advice is appreciated.

tldr: I have been with my boyfriend for more than 6 years and he hasn't proposed. And although he says he will, he hasn't taken any steps towards making this happen.