"or get married"
........Been There.......Done That
Then keep regular testing that's all you can do or get married. ;)
I am cool with the twice a year testing. So far I have been just testing once a year. As far as the condom failures go, they have happened twice with CSW supplied condoms (I know not which brand) and once with ones I supplied, Trojan Magnums. I tend to have very vigorous intercourse with CSW's and that is what I attribute the breakage to. I am careful to never cause injury to my CSW partners, several of whom are regulars, and I never use any oil based lubricants. The only lube I use with a CSW is AstroGlide that I bring to the appointment so I know where it's been. I can't think of anything else I can do to prevent breakage except lesson the intensity of my encounters; and that's not going to happen.
Anyone that is sexually active should be tested at least annually, in your case at least biannual. Any time you have a condom failure. Which you should look into why you are having condom failures.