This is going to be entirely up to you. a 1.61 probably has about an 80% chance of being a false positive, if not higher, and since neither of you have ever had symptoms, my guess is that it is.
If it were me, I probably wouldn't test. You had protected sex with her, so even if she had it, the chances that you got it from her are very, very low. Unraveling a false positive can take months, several hundred dollars and loads of stress. It's up to you, though. Some people prefer knowing.
There's a decent chance you'd get a false positive, too, but it's really up to you. There's no right or wrong answer here.