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"The prevalence rate is believed to be between 0.1% and 0.5% of the UK population."

So, if you were in the uk, you would have a 1 in 1,000 to 1 in 200 chance of the girl you are fucking having it. If they only got it in the last 4 months they might not know, otherwise they would have started to have symptoms. So of those 1 in 200 to 1000 most of them know they have it and would probably state that and if you are worried about it you will probably ask.

What's the odds of your relationship ending eventually? 1/1
What's the odds of that happening in the next 8 months? 1/100?
What's the odds of you getting laid in the remaining time between when your relationship hypothetically ends and the end of the 8 month period? 1/1000? And given that you never got laid ever before this girl... maybe even higher than that. Your so called 1st partner does not count. If you didn't fuck you weren't partners because 'partner' is a contraction of 'sexual partner' in this context.
What's the odds of her having Hep B? Between 1/200 and 1/1000.
What's the odds of her not knowing that she has it because it is within the first 4 months of her own infection? 381 new cases a year so assuming equal split male female and using bad maths, only around 70 girls in the whole UK have it and don't know they have it.
What's the odds of her having it and not telling you even though you ask? If she doesn't want to go get in a whole bunch of legal problems for purposely infecting you 0.
What's the odds of you contracting it if she has it? Don't know, but that's not 100% either.

If you live in another relatively well off nation, these figures will be not too far different.

So, what are you talking about?

Unless you aren't telling us something...

Your relationship probably won't end in the next 8 months.
If it does you really aren't likely to be getting laid straight away, especially as you never got laid ever before.
If you do manage to get laid straight away approx 70 females out of 34,000,000 females have it and don't know and therefore you wouldn't know. Those 70 spread across different ages of women which may be outside of your range too. Some of them too ugly or fat for you. Out of 70 totally random women how many would you fuck... or would fuck you?

So only if all those things happen and you fuck one of those 70 out of 34 million and the girl decides to lie to you...
... and then there's condoms and dental dams and you can make sure you don't have open wounds in your mouth or on your dick and that neither does she... I've never considered it, I've not been tested to see if I'm at risk. I didn't even know that was a thing till you said it and probably most people don't. This is nothing.

These are lottery jackpot level odds you are worried about. There's a thousand things that will hurt you before that and you aren't taking any precautions relating to those risks.

None of that makes you have a scarcity mindset. You have some issues as you admit around sensitivity and fears that's where this is coming from, not the other way around. Maybe seek some kind of help for those issues. The fact that you would obsess on this highly improbable scenario is the real issue. Why are you afraid she will break up with you? Did home life make you feel like you aren't deserving or are you unused to being happy and are unable to be comfortable in it? Get real help, if any of that is what's up.


Peace,

kowalski