it's so easy to tell man.
-when you used to enjoy being together, then all of a sudden, it becomes a chore
-when you find yourself alone on your restday when you used to spend it together
-when the person you love constantly find something wrong in you even when your intention was to serve him/her and make her/him happy
-when he/she accused you of cheating suddenly, out of the blue. bisan wala man pud
-when gadudahan ka niya... everytime. Bisan way hinungdan
-when he/she finds ways to start a fight
-when he/she makes excuses why he/she can't be with you on that day
-hugs and kisses gets limited
-when he/she no longer responds to your "I love you's" or magpabungol bungol
-when you try to confront in a very calm manner and then he respond in anger.
-kanang itago ang cellphone or even takes the phone bisan magscuba diving sha.
so many ways to tell... But then it takes experience of being cheated on to know the signs sometimes. heheheheh!
Looking on the bright side, that person na nakigduwa sa laing team will hurt you and teach you how to be stronger and tougher.
Good Vibes! ^_^