I just need someone to listen and help...

Hey guys...I just really need help..idk what to do. Here comes a long story but I really need advice...

So my boyfriend's dad has had cancer for a few years now...and he went for surgery the other day...and they found at least 25 tumors spread throughout his liver and diaphragm....there is nothing more they can do...and they are supposed to be moving to Texas in a week...my boyfriend goes to the same college as me in PA so he is staying here to finish school and live with his grandparents so he can save money... I stayed the night at his house last night while his dad and step mom were still in Pittsburgh in the hospital. everything was okay untill this morning....I knew he was hurting...but he hides his feelings so well... When morning came he was moody...upset... claimed it was nothing...I could tell he was lying....I thought I upset him some how so I just felt like crying... we ate lunch in silence..sat in silence...then he went in his room and layed down. Once I realized he wasn't coming back out I went into lay with him. I held him and told him I wanted him to talk to me...he said "my dad's going to die ..they are moving half way across the country...and I'm moving in with my grandparents" ...I held him some more and rubbed his back in the way he loves.... I felt useless like I couldn't help I just wanted everything to be better....then all of a sudden he starts pulling my pants off...I asked him what he was doing and he was upset and said "what now I can't eat my girlfriend out" sorry tmi..... But he seemed so confused with his emotions and upset.. I pulled up my pants and he layed down next to me upset... I help him some more...I didn't wanna do anything sexual because it just felt so wrong. He wasn't okay he said he wanted to do it so he could get what was upsetting him off his mind... I knew he just needed held...well 20 mins go by and he's kissing me...just softly...and it does turn into sex...loving sex...but emotionally hurt sex...he wasn't okay... He finnished and I didn't...I didn't want to I just wanted him to be okay...he took me home and it was silent for the 20 min ride....he said he loved me and apologized and then went to work....but everything just feels so messed up....he's so mixed up in his emotions...I want to help...but I feel so lost... ( Btw I'm 19 and he's 21)... I just want to be there for him