My bf doesn't like saying I love you and doesn't appreciate me

Okay, so I have been with my boyfriend for 11 months now. At first things were great, we would go out, hang out, cuddle, etc. After about 4/5 months, he started acting weird sometimes. When I would go over his house, he would like to play online games. It wasnt a problem before, but recently of about 2/3 months, he seems to play online games for hours while im at his house, and i only see him once or maybe twice a week. We are intimate but we rarely do it because sometimes he doesnt feel like it...he has never bought me flowers or a card or any little trinket at all. he thinks that paying for food is the same as giving me a present. He doesnt celebrate any holidays so that makes it worse. I said I love you first over thanksgiving break and he said it back. We would say it until i realized about 2 months ago that he would only say it back if i said it first; otherwise, he wouldnt say it at all. When I talked to him about this he says he's not comfortable with saying it and he doesnt like saying it but it doesnt mean he doesnt care about me, and so on. I also talked to him about the gifts or flowers or all the other stuff he neglects me on. He just says thats how he is and he cant change it. It got to the point when i told him that we both have to contribute to this relationship for it to work, i need you to be more affectionate to me, call me more, and so on. We agreed to work on it, and he has been calling me more. But he doesnt say i love you. Ever since the talk i havent said it either and he never tried to say it first. Tonight we had a kind of little fight on the phone about the three words and he said that if i dont like so many things about him i should just break up with him and a few minutes later he hung up on me. 4 hours later i called him a bunch of times, no answer, then i called and called again. Finally he answered. Said he was eating. i asked what he had been doing that past hour and he said nothing much. I asked if he say my phone was ringing and he said yes. i asked, did you just ignore my calls? and he said: i didnt feel like answering. So i said fine, ill talk to you later bye, and all he said was: ok, bye. He's so nonchalant sometimes!! He's not a bad guy cuz sometimes he can be very sweet...but why is he like this like 80% of the time?!?!?!?!?!? I don't know what to do. My friends tell me to break up with him but I love him soo much. What can I do? :( :( :( TT :'(