Is this a trust issue or jealousy?

well as a over the road truckers wife i am very new, my husband has only been over the road since august. we decided to buy our own truck and lease it through another company. it was hard at first adapting to his being away from home so much but he had my whole hearted support knowing he was doing his best for our family......
then came the messeages to people on line...i got past that, then a while later it was another message letting someone online know he was in town for that weekend....okay i got past that....broken but love him so much.......
no someone from a company has invited him to join and i have found emails to and from one leaving his number but then saying thats right you already have my number....

if i say anything to him he makes it out like i am being jealous, it is not jealousy it is a lose of trust, he knows i am true to him but when he makes me feel like i am doing something wrong about feeling betrayed i don't know anymore

any advice