5. When you feel controlled
Being in a relationship is not prison. When you must not spend your time or even resources on anything unless you have put in a word with your partner, you are in the wrong relationship.
Examine both of you and determine how much freedom they have. Now compare it yours. What is your answer?
6. When you feel that their happiness depends on you
Every healthy human being (except those who have huge issues such as the loss of a loved one) has an Internal Happy Stimulator System (you saw it here first and probably last). That is, everyone should be capable of cheering themselves up and not relying on external factors to do that.
Of course, the romance in a relationship keeps one happy. But if you feel the need to do that which will only please your partner, the joy of that happiness is reduced to a forced stimulation of a smile from your partner through something that you half-heartedly did in hope of seeing that smile. When this happens, you, my dear friend, are in the wrong relationship.