relationship with a classmate from 2001 to 2004. She appeared fine but I dont really know. When I got worried about me getting HIV infected (and she asked me to get tested) I got myself tested in June 2006 (two year after the last exposure with her), which was negative. I dont know which method was used for the test but I got the results in one hour.
Then in July 2006, I visited a massage parlor, fingered the girl, who was giving me massage and used the same hand
For your first concern, your test result is conclusive. There is absolutely no chance you got HIV from her. Period.
Now, regarding fingering... there is no way you can get HIV from fingering. Even if you masturbated yourself after. HIV cannot be transmitted this way.
The quick HIV test is ~100% reliable. It picks up all negatives, and gives false positives a bit higher than the traditional test (that's why a positive must be confirmed).
You can forget about it man. There is no way you got HIV from fingering. Time to move on.