My cousin and her ex-husband are living in such a state. They only meet once a month on weekends, and sometimes they stay together for two days every half month. Even with children, it has not changed the "half sugar" thinking.
This marriage pattern lasted for three years and ended in divorce. The reason can be imagined. Long-term non-communication, so that the gap between the two people is getting bigger and bigger, feelings are getting weaker and weaker, and topics are getting less and less. It seems logical that the marriage should end.
Therefore, I personally do not advocate separation before marriage and after marriage. Since we chose to get married, we must accept that there is one more person around us from now on, sharing weal and woe.