Just so heartbroken

My boyfriend and my have been together almost a year...We have had a pretty rocky relationship so far..He's never given me any reasons not to trust him he's so sweet and I honestly thought he was innocent because I am his first girlfriend.. Well I check his phone last night and I was shocked to see he had been looking up pornstars on his instagram which I knew he watched porn but to go out of your way to look up the people is just wrong...but what really hurt is this girl posted on snapchat 1,2,3,4

1 being kiss me,2 you wanna date me 3 you miss me

He sent her a 3 and she said "I miss you too" and he Didint respond..but what hurts the most is this is a very pretty girl that he was talking to even a month after we were dating he said "We can talk when you 18" & "its that but I actually also have a girlfriend rn" and she said "thanks for letting me know" and he just said "Yeah" (this was one month after we dated) I confronted him about it when he was sleeping very abruptly and told him he had to go hes like "I cant have female friends" and basically acted like I was in the wrong aparently because I woke him out of his sleep and he had to work at 4 am he was pissed and I basically had to beg him to work it out with me.

Today I asked him why he was being so mean to me and not letting me talk to him and he said "Idk,I was tired and I really didint wanna go to work tired"(work in construction) but like if you care enough for a relationship you dont just sleep...

Im so sad right now constantly thinking of all the wrong hes done..Ik so hurt I don't want to leave him cause I love him so much and genuinely feel he loves me too someone please help.