How can we work when we love each other so much yet argue even more!?

[advice]

me & my boyfriend have been together just over a year and the first few moths were amazing ..we had the best of times together and didn't break up for months..however around 6 months into the relationship we argued and i ended it and ended up kissing someone else which is what i have done pretty much every time we have broken up since then but only kissed..however i have had girls ringing me saying things was happening with him when it wasn't and he thought it was hilarious..ive had him txting other girls but yet i believe he has never cheated..its got to the point now where were breaking up all the time but believe it or not its unbelievable what we would do for each other and how much we love each other but we always argue cuz he tends to think i always cause arguments which i do i guess and i think hes amazing with me through the week and then weekend comes he doesn't care...he will do anything for anyone else but nothing when i tend to ask..i know he loves me..just as much as i do him...were not perfect together we know that..but we just dont wanna let it go but dont seem to know how to get around it or why we keep going wrong i just wanna change in to a person that can work with him but when im really nice to him he seems to take the piss but doesn't think he is doing..i really dont have a clue what to do cuz its getting to the point where we cant live with or without each other and its really hurting us both which is the last thing we want..we just want it to work but how?? were both young..and hes a few years older than me..him being 22 and me nearly 18..i just feel like im always the one in the right and hes wrong and vice verse..we just dont want to let it go.. believe it or not when we get on we have so much together..its from one extreme to another