As you said that you can definitely save a lot of bitcoins before you get married but it is true because when you get married you will have a separate expense so you can definitely save a lot of bitcoins before marriage.
Before marriage seems to be a very good time, but who says you can't do that also after marriage?. Getting married comes with lots of responsibilities, but that shouldn't be an hindrance to one's investment life. Moreover, the person getting married will certainly give birth, which your investment can be helpful to the children just like most people do.
I agree with what you said in this case because after all when we are in and investing in bitcoin actually a matter of status whether we are married or unmarried should not be a reference to whether we can be in bitcoin or not.
Investing in bitcoin depends on the readiness we have no matter if we are married or not because in the end as long as we are ready in the sense of being fully prepared with the planning, strategies that we will do and the consequences that we will get when investing then indeed everything will be fine and can invest in bitcoin comfortably.
Don't complicate yourself too much by making marriage the reason you can't be in bitcoin because I don't think it will be makesense and sounds just a classic excuse to cover up the fact that you are not ready to be in bitcoin.
I found out about bitcoin after I had a partner and until now I am still quite comfortable with the investments I make without hampering the basic needs of everyday life because I realize that it is precisely by the existence of bitcoin and I invest in it that I am more able to manage good finances and limit what I have to do with the expenses I face while preparing for the future so that I can achieve my own version of financial freedom.