Why is this happening?

My wife and I are going through a divorce a few times now we have had a heart to heart which lead to us having sex, however when we did it I literally stick it in and boom I'm done worse than a 2 pump chump!

But when I have sex with some other girl and can last for hour or even hours!

Of course the 2 pump chump thing happens and it totally ruins everything, even go back to the way we've been lately which is arguing about every little thing.
So why do you think I cannot last with her but with other women I can !!!
Why is this happening?
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