<human>: Could you distill the essence of the text into 1-3 sentences?

What do you call a relationship that isn't just Fuck buddies but also isn't a long term relationship?
Its not that I want to just get in her pants because I do like her, but I couldn't see myself with her for more then a few months as I tend to get bored easily. How do I tell a chick this without her either
A. slapping me in the face, calling me shallow and never speaking to me again or...
B. wanting more then I can offer at the moment
Does this make me shallow or am I just talking to the wrong girls?
<bot>: How do I tell a girl that I'm not looking for anything serious without her thinking I'm just looking for a hookup