how to get a cancer mans attention back :)?

[Gadget]

As a Taurus you are in an ignorant bliss and want others to be. You can also be more self-absorbed as the 2nd sign. For instance: he was rude for just walking away and not saying hi but, you aren't for doing the act of procreating with his friend...what? Huh?
A Cancer is sensitive and considerate so, he can't "ignore" that you mated with a friend of his. You are not a part of his "bliss" anymore. It's like he picked out a great pair of boxer shorts and then his friend walked out of the bathroom with them on. He also probably knows the caliber of females his friend has been with before and after you which may have lowered your value to him.
Your signs are compatibility (after maturing). However, he doesn't think you value or protect your intimacy. Cancers are possessive due to their protective nature, not as much as Scorpios. He protected the girl's ignorance of who you were by walking away and not saying anything.
Plus now, he probably can't trust what you would do if he didn't speak to you next time.