Unhappy in my long-term marriage: do these issues mean we should split up?

Okay here are my reasons for staying

I need sex. If I leave I'll have to get it somewhere which is possible but not always

Financial, it will be a hit

Companionship, currently we don't really talk, don't go anywhere together. But we do sleep together and have sex every night nearly.

Children, the children 21 and 22 are happier when we're together. And they are in an exciting time of life.

What am I unhappy about?

She's not very attractive. Unsurprising she's 56

She's overbearing. Like very bossy.
Comes out when she's annoyed which is 60% of the time
Apart from that flaw she's very capable person
Formidable I would say. But that's great for having children. Not so great for going to the cinema together if you get me.
Unhappy in my long-term marriage: do these issues mean we should split up?
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