Am i insecure or is he hiding something?

well I've been involved with this guy for like a year and a half but have known him for almost 3 years.. ive wanted him since before we were together and i love him very much but im not sure if he loves me like he says he does.. it has been such a crazy journey trying to be with him.. everything from girls trying to tell me stuff about him so we will break up and just its been crazy.. no he has never cheated on me for sure.. not that i know of.. there was once when i looked through his phone and seen a pic of a girl in his inbox but he swore to me that his friend was using his phone.. i never believed him but i love him.. and other than that he doesnt do anything too shady.. like he answers his phone in front of me.. he never usually hides his phone.. never gets calls late at night.. although when i look through his call log there are a lot of unknown numbers.. kinda suspicious.. but he checks his voicemail in front of me so if he didnt answer some girls call im sure she would leave a voice mail..i mean i would.. but idk.. a lot of why I'm so insecure is because I've had such a rough life.. lots of death and lots of betrayal.. see so there are things that make me believe a woman's intuition is always right but a few things that make me think I'm just papanoid. i need some outside advice..