Did I read that right? You friends are talking about marriage to bf already?
Things may be going great but that just sounds foolhardy to me. Besides if you send the rest if your lives together, why rush?
Unfortunately I don't think you can fully protect yourself from abusers, to live you gave to be open and to take that risk and there us always a chance that you'll get hurt (whether by accident or by abuse) but the alternative us to close ourselves off - and that's not much fun either.
Hope you're having a good day
Both mid 30s, 2 young kids BD 7sep14 XW moved on long ago, now living with OM1 D paperwork in progress