Last Saturday (16/03/2019) I had sex with a guy known each other for several months and that I did foolish that it is always destroying my mind up until now. He repeatedly said and insisted that he was never let anyone put inside before as well as I am the first guy sex of his life. Anyway, I supposedly he is HIV+ first on worse case scenario.
Actually, my only riskiest is that I put (and was put) "mine" inside his anus totally about 3 times with not over 5 seconds each (so 15-20 secs in total) so it may be considered "dipping" in this act. Only one single dipping had few thrusts and surely lasted within 4-5 seconds and I pulled it out, then ejaculated outside.
With this risk, I am not that sure if it is considered much risky act or not.
Anyhow, my last test (4th generation) results Negative on 2/03/2019 (14 days before this incident).
And I plan myself to get tested again 15 days post exposure for the sake of peace of my mind.
Thanks everyone for your help.