There are many different ways when you can tell that it is time for a divorce. When you do not feel or love the person that you are with the same way anymore it is usually time. If you are not getting along well all the time it is usually time. Only you can make the call.
You know its time for a divorce when no other option is left. After you have tried different ways of continuing a marriage and you are still miserable, can't get along or just had enough, its time to move on. You can try a separation before making the final cut if you are unsure.
If you can not stand to be around that person. You don't feel the love. Not talking to each other, I could go on and on. You have to decide, if you want to keep living the way things our now. I been married for 23 years, the last 10 years of it, I wanted out. But I did not believe in divorce. It got where I could not stand to look at him. 3 years ago I kick him out, the best thing I every done. I am happy now. But before you go that way, you guys need to talk see if you can work things out you never know. You might fall back in love.