Alot of sexual inexperienced guys giving advice in this thread.
First of all when a girl says "what are you doing" in a situation like this, she is just playing dumb and it means absolutely nothing. Don't waste your time using highschool lines when she says something like this. Just kiss her and start doing your thing. If she is in the bed with you then she is fully aware of what is happening, and if she isn't it means you're in bed with a retarded girl. If you're still having to do that ****y funny act when you're already in the bed then you're already a few steps behind.
Why you guys feel the need to put on that ****y funny act 24/7 is beyond me. When a woman is in the bed with you, you don't have to pull highschool one liners to escalate things. You should be handling your business getting the two of you off, not worrying about what lines to say. In situations like this the only time your mouth should be moving is when it's between her legs.
I can guarantee you she didn't climax and when she said "lets just take a break" it was only to get you off her because you were doing a bad job . There is no mistaking it when a woman comes. I'm not trying to sound harsh but the reason she's not getting into it more is most likely because you're doing it wrong.
I recommend going on google and reading up on proper foreplay of how to kiss her body, finger her, and how to eat her out so that she gets off and is super aroused before you even begin having sex. There are even videos on how to properly finger and go down on a woman (not porn). I have never been with a woman who lost interest in having orgasms so the problem is on your part. Read up on proper technique and the practice it on her and eventually you will be a sex machine. Get to the point when you can get her off multiple times and you won't have this problem, but you need to know what you're doing first.
And to the guy who said that you should stop in the middle of it, stop giving advice. If you want her to be more sexual with you and crave it more then you will achieve that by giving her multiple orgasms not stopping before she comes. Stopping in the middle of bad foreplay and bad sex isn't gonna make her want it more.