Step 1: If your girlfriend is also your best friend then move to step 2.
Step 2: if you both want kids then move to step 3.
Step 3: If you want to protect your assests against your best friend with whom you want to build a family, go ahead and setup a prenup. Though, you might get stuck at that step because you'd put your money or your career first then your wife (best friend and mother of your kids) second. Why not? It's totally possible. Thought, I would NOT recommend a marriage in this case because it doesn't make any sense.
Step 4: let's say you skipped step 3 and made it to step 4. At this stage, you can pop the question, it makes sense.
Step 2: if you both want kids then move to step 3.
Step 3: If you want to protect your assests against your best friend with whom you want to build a family, go ahead and setup a prenup. Though, you might get stuck at that step because you'd put your money or your career first then your wife (best friend and mother of your kids) second. Why not? It's totally possible. Thought, I would NOT recommend a marriage in this case because it doesn't make any sense.
Step 4: let's say you skipped step 3 and made it to step 4. At this stage, you can pop the question, it makes sense.
Congrats.