dreaming715,

It sounds like you two are not on the same timetable and same lifestyle.

The question is what is your timetable?   When do you want children?  I see that as the most important in being in agreement for you since you have that biological time clock ticking.

Have you communicated that with him?  There are good economic/legal/psychological reasons to have children in a marriage rather than out of wedlock.

https://www.city-journal.org/html/why-marriage-good-you-12002.html

Are you willing to walk away if he does not commit to settling down?  Those questions you need to answer within yourself and use as a basis of discussion with your partner.  It is good to have a bottom line even it seems like you are giving him an ultimatum.  This is your life.  Otherwise you are living your life for him rather than for yourself.

Mark