Talking about the future feels wrong
Discussing the future should be something that inspires and excites you and your partner. If there is awkwardness between you, this is an indication that you may not even want the relationship to continue for a few more years.
If picturing a life together leaves you feeling a sense of dread or sadness, give some serious thought to why this is the case and consider whether the reasons lying behind the feeling are things that could be improved with effort.

Your communication is consistently poor
Most relationships begin with a flurry of constant communication. However, couples have to work to sustain this type of closeness by making an effort to spend quality time together. If conversation between you and your partner feels superficial, your emotional intimacy is no longer optimal. Constant arguing is another type of poor communication.

You have fallen for someone else
Every couple has different ideas of what is acceptable when it comes to looking outside the relationship. If you are in a monogamous relationship, developing significant feelings for someone else is a clear warning sign that you may be falling out of love with your partner. If you find yourself daydreaming about being with another person, catch yourself thinking of them during intimate moments with your partner or realize that many of your waking hours are consumed by thoughts of this individual, this is an indication that you need to take a closer look at the condition of your real relationship.