There is no one answer to this question as every relationship is different. However, typically by the 8 month mark couples have usually progressed beyond the honeymoon phase and are starting to get into a more comfortable routine with each other. They may have had their first big fight by now and worked through it, or be in the midst of working through it. Couples at this stage are also usually beginning to talk about long-term plans such as moving in together or getting married. So overall, the 8 month mark can be seen as a time when relationships start to become more serious.