CHEATING!?

dec 2016, my husband gave me his sd card and all of his contacts were saved onto my phone. i saw he had 50 emails from craigslist personals saved to his contacts. idk if they were from when we were separated which was a yr ago before i found them, or when i was pregnant and he worked overtime everyweek, so he basically wrk 6days a week at that time. which was 6mths ago after our separation. march 2017, he bought a laptop, hes been acting strange w his laptop, taking it to the garage, everywhere w him. hes also been working overtime. he also wouldnt tell me the password to it. he finally told me today, i decided to look thru the history, and i found him on craigslist around that time, it only showed that he went to craigslist. but it didnt show what he did in it cause he deleted it. could he be messing around w the personals ad and deleted it so i wont see it?