1. Reflect on what drew you together.
2. Try breaking your routine.
3. Determine if your past is impacting your present.
All relationships have heated moments of tension. As these moments arise more and more, and as we start to see our partner more critically, we may begin to build a case against them. This is fairly easy to do, as no person is perfect, and we can always file their mistakes into certain flaw categories. When we build a case against our partner, we tend to be set off faster, jumping on them the moment they slip up or overreacting to them. In times of stress, fights tend to escalate. We say worse and worse things to each other, things we don’t even mean. This leaves us feeling pretty lousy about ourselves and our relationship.
Source Psychology Today