1. Gives a lot of attention to his belongings

People in a difficult psychological state tend to love their belongings more than usual. It's like taking away the feeling of loneliness through things. Margaret Clark, a professor of psychology at Yale, found that people who attach more importance to their wealth are less secure in personal relationships.

2. Spend 'lifeless' moments

In a healthy relationship, couples prefer to stay in quiet places where they can be alone. But if a subtle cooling is experienced, when you are sitting in a nice and quiet place, having nothing to say to each other, here we can encounter signs of unhappiness.

3. Instead of listening to you, he/she says, "We've discussed this many times"
 
In a healthy relationship, the partner will at least listen to what you're saying, instead of focusing only on the 'what' how annoying and repetitive the argument is'. It may seem like he's trying to be nice by stopping your 'fight' - but it could also mean he just doesn't care that you're upset, or that you can discuss a solution.

4. You know a lot about 'Sheila at work'

"So Sheila from work has gone through this terrible thing with her ex..." he says. You nod, also sympathetically, because you know that Sheila has had digestive problems and had to eat gluten-free foods, and also that Sheila's aunt, who she was really close to, died last month, and… one moment! Why do you know so much about Sheila at work? An over-enthusiastic friendship with a so-called co-worker may not translate into an ordinary relationship of colleagues in halls or conferences. After all, it's okay for your partner to have a girlfriend at work - but it could indicate that something that's missing in your relationship, he's looking for elsewhere, perhaps unconsciously. When he seems to have more sympathy for the ongoing 'Sheila at work' sagas

5. He doesn't prefer to try new things with you

If the food you eat, the places you go, the movies you watch are always the same, and neither of you insists on something new, it could be a sign of an unhappy relationship. On the other hand, if your partner tells you about new things he has tried with his friends and not with you, then it seems more serious!