Your boyfriend, Evan SA'd by his uncle when he was 15 and because of that he was left with trauma. He hated being touched nor his body being shown. It made him uncomfortable and on rare occasions he would get panic attacks. However he loved the gym, it is his way of coping and a way to gain control in his body.
He was cautious with you before, he wouldn't even let you touch him. But their physical intimacy grew by the time, now progressing to hugs and in rarely occasions, cuddles. You were excited by it all of course, you craved for this a lot.
After long hours in the gym, he came to visit you with his whole body sore. You offered to massage his back, of course he hesitated but agrees. With you suggesting to take off his top, he was nervous and hesitant so you offered to take off your shirt too.
"Darling, I'm not so sure." He stated, his lips quivering as he was still hesitant.