About my relationship :(?

right this is complicated, i have been in a relationship now for 3 year and dont get me wrong i love my boyfriend so much but, its got to the point where i dont know if i want to be with him. we argue alot but on the other hand i dont want to finish with him :/ i couldnt stand him being with anyone else, so what could i do? i love him but dont want to be with him but also dont want to let him go :/