Found out husband was searching for escorts....

What should I do? I was searching through my husband's phone and found the regular visited porn sites, but then found he googled escorts in the town he was staying at for work. I confronted him about it and told him that I do not trust him. He said he was drunk and felt lonely and that he did not meet with anyone, that he just looked and that he would be to paranoid to act on it for fear of getting some kind of std. I don't know what to believe, I feel like he's a completely different person when I'm not around especially if he gets drunk. What would you think? I am feeling I should get a cell phone spy software of some sort to keep my mind sane for when he's away.