Is he/ she cheating?

when someone your dating is suspected of this, then some of the signs i would look for is Distance, if they have a bad attitude toward you, if they want to be left alone instead of being with you as much as you usually are ... or if your bold enough and ready for it to all go down, just let them know how you feel ... and tell them what makes you feel that way and let them know if they are then your not someone who they can use as there door mat and if they want someone else so much then to just go and if its meant to be ... they'll come back!