I know that it is mentally perverted to think about your significant

>>18551950
You need to get her pregnant and have babies. That'll sort you out, m8.

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>>18551950
sounds like an open and shut case, Johnson: get cuckolded.

>>18551950
>it is mentally perverted to think about your significant other's past sexual partners
No, it is perfectly healthy.

>my brain keeps obsessing over it
Now *that* is perverted.
And also the core of the issue.

The cure is simple. It's not "your brain" obsessing over it. It's *you*.
But hey, that's good news. Because you're in control of yourself.

I'm assuming you have trouble directly "forcing" those thoughts out. Don't worry. Here's another good way to undermine the cause:
When this topic pops up in your head - belittle it. Make it seem that it doesn't matter; obviously it does now, because you're obsessed, but pretend it doesn't.
Whenever you think of it just go "whatever, it doesn't matter" and change topic.
As they say, "fake it until you make it".

That's how you deal with obsessive thoughts.

On a side note: once the weather in your head has cleared quite a bit, I suggest you talk casually about it with your SO.
You will find out that - indeed - you were wrong to obsess about it. And this will be the final push that, hopefully, will rid you of this scourge forever.
Good luck!