Asking again because i do need serious helpful answers!?

he is 24 almost 25 and on several occations i have found him talking very dirty to girls who are 16! i even had one girl contact me online saying he propositioned her 16 year old friend for knowing full well her age and he souldnt be doing that in the first place since he isnt single. i confronted him about this and he told me he would never do anything like that and why would he risk going to jail etc etc. most the time its just adding them on facebook and writing creepy comments on their slutty pictures but when i find conversations on his facebook chat asking a girl after he found out she was 16 if she was a girl i think i should be concerned, what should i do? could this mean he is peadophile? also i am scared to ask him about it again because he will tell me off for snooping, and i know yes snooping through his things is wrong but i wouldnt do it if i wasnt extremly freaked out and concerned. i should be able to trust the man i have been with for 2 years :(