Yes, I did this 5 years ago.
same kind of reasons really, we drifted apart & I felt more pressured staying than leaving. He is a good person, good enough dad but not necessarily a supportive husband & he had always left the load for me to carry! His only contribution's really were working FT & he would happily cook meals for the family most evenings. I worked part time & felt very much like a single parent.
I was struggling with peri menopausal symptoms & needed to find myself. I knew he wouldn't leave the house, so I got my little ducks in a row. Had the conversation with him one evening. He was quiet but didn't offer me any reassurances or suggestions that we could even try to make things work out. (I knew in my heart it was for the best)
I moved into private rental within a month & don't have any regrets.
Thankfully our 3 DC were 16.18 & 21 and they managed to accept it. (They were/are still our main concern)
Initially it was awkward but we both remained respectful towards each other.
I believe he went through the emotions of resentment towards me but he never voiced or showed it to me.
We have remained amicable and although separated we haven't discussed divorce or splitting finances. No reason why apart from personal preference (a divorce to me feels like breaking our family unit! Being separated but remaining married feels ok for us at the present time!.
We have trust in each other's verbal agreements that when the time feels right we will divide the finances 50/50.