Gps on my SO

Do you think its right that I have gps on my SO..lately hes been going out a lot ..he has a history of getting into trouble. .like dui arrest etc..and I checked the phone records called back a number it was a woman. He claim its a friend but the bitch isnt answering nor giving me any info abt the relationship. .ready to leave this loser alone..should I be so insecure or do u feel im right for snooping