A lot of people assume that their relationship will always stay smooth if it has never required effort. They live in this misunderstanding till the point they are broken apart. Relationships start off smoothly but we all grow as humans and we become different. As a result, our relationships always require utmost attention and care. What may started off as a bond with no fights and total peace now requires a lot of time because you two fight a lot. It is not something to worry up because if you two are focussing on it, it means that you both value each other and don’t want it to end.
I always stress on how important communication is. When time passes, people assume that there relationship has become stable so they can side-line it. As a result, they do not talk too much and often spend days without hearing each other’s voice. This can be extremely damaging because communication keeps two people in contact. You cannot treat it like it is something that can be done later. Your relationship was going fine because you two stayed in touch. It needs focus now because you have stopped talking.