We ended up not using protection as discussed stuff around testing (which he did) but anyway, I did end up with chlamydia at one stage (he claims he didn’t have it but had in the past, so could’ve passed it on from a previous infection). Then at my recent smear I tested positive for hpv.
If he had clamydia in the past, he would have been treated for it with antibiotics and to the best of my knowledge it would not hang around/recur, it would be gone. That's the whole point of taking the antibiotics - to clear it from yourself and not infect others. So it was a new infection - he either lied about getting tested, or got it after testing from another partner.
If you also came up positive for HPV - while it is not impossible it is from your ex husband and was dormant and therefore did not show up on previous smears (also smears have only tested for HPV in recent years) .. ....but it seems much more likely it is new. And that's why it's been detected on your most recent smear.
He had therefore infected you with at least one, probably two STDs since you started having sex with him.
And surely he must know about clamydia being treated and cleared by antibiotics so he's either lied about getting tested and didn't know he had it, or got it since testing and saw fit to bullshit about it not being a recent/new infection.
This is not health anxiety. He's given you at least one STD, probably 2.
It was a mistake to have unprotected sex with him. Which you're obviously aware of.
Yes, condoms are not 100% against hpv +or herpes) but they're better than not using them.
It seems like you knew and accepted this was not sexually exclusive.... So it really seems risky to have not used protection.
Even if he got tested beforehand, he was not exclusive after so he could have infected you with anything he got until he got symptoms and got it treated !
Clamydia doesn't give strong symptoms in lots of people, which is probably how he got it and infected you .... And most strains of HPV give no symptoms.
He is clearly putting it about a reasonable amount to have got and passes on two STDs to you so far, and is not fwb material or at the very least is not fwb material without condoms. He very likely doesn't use condoms with other partners either; since he's been happy to not use them with you and since he's gotten clamydia off one of them.
I really think you're being extremely pessimistic that you could not establish an exclusive fwb or even relationship at 40 yrs old.