It is very normal for couples in long-term relationships to argue - and arguing in itself is not an issue. Conflicts are necessary as a partnership involves two people who will have different emotions, concepts and values. These need to be negotiated regularly. The issue is HOW to argue.
When fighting isn't working – how to make it work
When there is conflict within a relationship we often feel that there is something wrong with the relationship or something wrong with us. This, however, is not necessarily true, as conflict is a way to enable change and to work through issues that invariably come up when two people are trying to share a life together.