thanks, what signs would there be then after so long?
Alright, yes you had a risky encounter 6 years ago. However, the chance that you got HIV at that time and it had not significantly progressed by 6 years are not high. Your partner has told you that he was not infected, and people rarely lie about these types of things.
Now, symptoms are NEVER a good indicator for HIV. So many things can cause enlarged lymph nodes and the symptoms you are talking about.
The only solution for you, is to get an HIV test done. You do not indicate where you are from, but many places offer point of care testing that can give you results within 10-20 minutes. You can also get a blood test done, but those usually take a while to get results back (meaning further anxiety for you).
All I can say to you is that it doesn't really seem to me that is likely you have it all these years, especially given the fact your partner is reassuring they have been tested. Go and get tested though, and if your result comes back negative then you can totally put this out of your mind.