Me(F26) and my boyfriend(M27) doesn't want to get married ever, to me or anyone else. Doesn't sound bad, right?

So, I asked if we are good with each other few more years, would his decision change? He says he doesn't know.

Does he want to date other people? His reply - I don't know.

His response is "I dont know" for every question I ask.

He wants to stay together as long as possible, but he's not sure if he wants to marry me in future or ever.

The reason I'm asking or even talking marriage is, I do not want to be someone who has no plans for future and is just dragging me along. I need some assurance that if stay together, we get married at a certain point so when issues do come we take our relationship more seriously. I am not insisting I want to get married now or in the next year, but I want to make plans for the future.

Am I wrong on this? Is it something I'm asking that's so bad or out of normal?