Definitely not calling as much, and a lack of wanting to hang out as much.

Here's some even better ones: she tells you she wants to spend more time with her friends; she doesn't call when she says she will; she doesn't respond to or send you text messages; she brings up anything about her single life (she misses it, she's confused, past stories when she was single, etc.)

sHE ONLY LOSES INTEREST WHEN SHE'S TESTING THE RELATIONSHIP?

loosing interest when there is someone else already...

when your girl friend don't care she did'n call you she refuses your invitations and when you are together she looked always to the clock