I read some of your post history. Marital problems generally build over time to a booking point.

You say things have been off for the last six months but according to your post history you and your husband have had heated arguments about your biological kids who still live with you.

The thing that stuck out was that your husband seemed to feel that you were more on their side and didn't feel his advice to you about your actions enabling their stunted adulthood was considered.

The above pitted you and your biological kids against him and showed your allegiance to the offspring of another man. Your husband probably feels like a secondary player in this situation.

I imagine that the above plays into your recent marital problems.

To resolve this you must be more considerate of your husband's input and side with him. Your adult children's problems are becoming a wedge to your intimacy with him.