Spending Less And Less Time Together
This one is connected to the first sign. If there is an emotional distance between the two of you, then there is a strong likelihood that you and your partner will be spending less and less time together.
Your partner might want to spend more time by themselves or with their friends and family and you might feel like they are not paying enough attention to you which is not a good sign. Try to work things out.
Try asking your partner why they are not spending enough time with you. If things continue along these lines (where your partner either spends less time with you, or they keep making excuses) for an extended period of time, then your relationship is headed in the wrong direction. There are steps you could take that can salvage the relationship, but chances of that happening will grow less every day.