I think you have to ask what you value in the activity, and decide whether or not that value is being met. If it isn't, can you do something to change the way you interact with the activity, or the way the activity interacts with you? In relationships, if you value emotional connections, you'd be displeased by not having your emotional needs met. That doesn't mean you should give up right way, because if you really value what you're doing, you'll try to see if things could improve based on whatever relevant factors there are--maybe you have a conversation with your significant other, or you try to put more effort towards being romantic. That's the example most relevant to my life right now, but if you aren't enjoying something, ask yourself the question, "Could this be better?" If the answer is no, then it's time to think about moving on.