So now that he's trying his moves on another chick...to the extent that she's sending her private part pics, I'd say he's not 100% committed to you anymore.

If just joking or light flirting then it's ok la, coz sometimes during working life you need such social skills to survive. But not until the other party shows b*** or p**** coz that takes a certain level of effort to achieve.

Finally, don't buy it if he says he's just fooling around with her. Know that he is just as CAPABLE of fooling around with YOU in the same manner too.

It takes 2 hands to clap. Girls, ask yourself this question? Would you willingly simply send ur private part pics to a guy if he did absolutely NOTHING to lead you on?