the lifestyle genuinely saved our marriage and im scared to say that out loud

im posting anon for obvious reasons but i need to say this somewhere. were in our late 30s, two kids, dublin. 2 yrs ago we were 3 weeks from filing. like papers had been printed. we hated each other. opened up as a last resort literally i remember saying "well it cant get worse." it... did not save us in the sexy way people talk about. it forced us to talk. like really talk. about jealousy, about what we actually find attractive, about why we stopped trying. weve been more honest in 2 yrs than 11 yrs of marriage before. is it sustainable. is this just a honeymoon phase for non monogamy and were going to crash. has anyone been doing this 5+ yrs from a similar starting point. im so nervous to trust it