Welcome back to the forum.
I'm sorry to hear you are having such uncertainty about your partner's truthfulness and worries about HIV. They seem quite overblown. People rarely lie about HIV status when asked directly -- and although I cannot comment on your suspicion your partner has had sex with other men, from both his reassurance and his test result, there is no reason to suppose he actually has HIV. The statistical chance he was in the window period when you last had sex is low.
In addition, it is not true that "you never know" about protected sex. If a condom was used and did not break wide open, protection was complete. There is no such thing as microscopic pores in condoms (especially latex ones) through which HIV and other bacteria or viruses can pass. That's an urban myth.
Accordingly, I am confident your latest negative HIV test result is reliable and that no further testing is necessary. However, you are free to be tested again if you would like still additional reassurance you were not infected during your last exposure. You can expect any additional test results to also be negative. (And no, the specific test methods make no difference.)
I hope this has been helpful. Best wishes-- HHH, MD
Thank you so much doctor!