• Violence

• Control and manipulation

• Abuse

• Indifference

• Betrayal without guilt or attempts to repair

All of these plus many more are signs why you might want to consider a divorce. However also consider that repair and healing from all of these is possible in certain circumstances, primarily both parties have to be willing to do a lot of hard work with a good relationship counsellor. If one party is unlikely, unwilling or insincere about doing this work then it is not worth the effort and time on your part.