I think I should end it but I need a nudge

I am 17 and met my boyfriend of 19 at the time online, he lived in Italy and i in England. After talking for a year he moved here and we began going out properly, we have now been together for nine months. Since he first got here i have been seeing messages on his phone to and from other girls in other countries (eg.usa, spain, australia, italy etc) saying how attractive they were, thats hes single, sending pictures of his body that arent even him. i have confronted him, after which he has said im sorry blah blah i love you blah...so long story short this has happened three or four times properly and i have ended it with him twice. Obviously im weak and have gone back almost straight away. His excuse for doing this is that he gets bored when im at work or school, he only goes to school three days a week and has no job so hes pretty much always bored or asleep, this doesnt make me less paranoid that whenever im not with him i have to be in constant contact with him or he'll get 'bored' and do it again. Every time i go back i argue that he makes no effort in the relationship and it is always me, im the one going to him, getting his shopping, paying for dinner yet when i get to his house he wont talk to me for hours and will just turn to the wall and sleep, not even bothering to get out of bed when i leave just shouting goodbye from under the covers. i have tried to discuss my feelings and he just says "what do you want me to say?...im sorry?...". I feel as though ending the relationship is probably the right thing to do but i know that i love him, im 18 now and he is 20 and i know im only young and i feel stupid when i say it but i know that i do. I need someone who doesnt know me or him, isnt biased in any way, to tell me what to do or at least tell me what they think i should do. Please help me ahha Thank you!

You need to get out now before this gets any worse. He gets bored? so tell him to read a book, watch tv, or chat with friends in an appropriate manor. Hes a liar and a cheat. You need to value yourself more and dump him. Be careful, if you threaten to break up and then just get back with him it will show him that you will just come back and he can continue his crap.