Cheating ?

So my boyfriend does trucking and travels . This past particular weekend he comes home and as I’m about to go down on him I felt something rough and I cut on the flashlight and saw healing scratches on his genital area . He swears he’s not cheating and he’s the type that would always tell me in advance if he had a scratch or something so I wouldnt assume . I think he was cheating . Should I believe Him or no. In the past I’ve seen him on little dating hookup sites and etc. lmao y’all help me I can’t keep going thru this 😂we have a infant and another otw