I once watched a talk show where a famous actor was being interviewed. The host asked her how things were and she excitedly talked about being pregnant with her first child. The talk show host congratulated her, and then asked about the house she and her boyfriend had just bought.
For the next several minutes they both chatted about how great the new house was and how excited she and this actor's boyfriend were to have a baby. The talk show host then asked her, "So are there any wedding bells in your future?" To that the actor replied in a surprised tone, "Oh no! We're not that serious yet."
I am only curious about how "significant" others are when people are willing to have children, buy property, sign long term leases, share bills, sex, germs, holidays, vacations, household chores...but not make a full commitment to the relationship in the long term.
I suppose my advice would be to ask yourself "why"? Why invest this much energy, emotion, time, money, and intertwining of your life if there is no commitment to the long term.