help me im doubting my bf which is really bad?

[Miss]

we are together for 9 months,hes the best guy ive ever known,he doesnt even have girls on his phone fb,twitter,nothing, he cares so much for me,he used to come every week and it takes 2 hours from his city to my city just to see me for few hours then go to his campus,he buys me many gifts,last one was an ipad cuz i got sick he doesnt freak out when i touch his phone or something, he takes me dinners and dates he always says that he wants to marry me when he graduates
but sometimes i had caught him hiding or lying silly things like for example watching porn saying and swearing that he doesnt watch while i know he does!and i really dont care if he does or not.
so it makes me always doubt if hes saying the truth or not ,also ive really heartbreaking past with my 2 exs,ive got cheated on and hurt and screwed up

my bf has this ex gf that he says he hates after she hurt him,so i was checking his followers list cuz im looking for some page,i saw her following him, i told him to block her and he did it,in the same time she followed him she got msgs on ask.fm from annonymus tellin her''stay away from my bf b**** '' and things like that'' i just felt like its him..even tho no names were mentioned.
then i looked down at her questions i saw some weird questions like''i still love u''i miss u'' ill never stop loving u'' do u remember me'' ''single taken?''u r hot'' things like that from while to another and her list is not even big,this girl is bitchyy and gold digger and really awful.i dont have proof that its him but idk why my heart says so,i cant talk to him about it anymore cuz last time he kept swearing to god thats not him and said i dont trust him..this thing is eating my brain,i dont know what to do..i really love him but i feel betrayed.should i ignore it or what?

[Ilas]

Are you serious? This guy is completely in love with you and you are looking into stuff that isn't even his problem. "Stay away from my bf" she might be chasing a guy and his gf wrote this to her, people joke around to do pranks or what ever, if you bf has a relationship with his ex why would she hide it from you, she will certainly come and rub it in your face. Don't bring your past and insecurities up to your boyfriend and act weird until he finally loses all interest in you.
Did you catch him watching porn or you assumed that he did because all men do? He could be one that doesn't and you were accusing him of lying. How would you feel if he starts accusing you of lying all the time, you will walk out on him and never look back. So don't ruin what you have, because of things in your head that he never did.
He doesn't follow girls on intagram, or have girls on his mobile and facebook, so why are you mad if girls are following him, don't tell him to block them.