I loved her so much so that the thought of seeing her made me restless at work

Wen my cousin sister first introduced her to me, I asked her out but she told me she was engaged so I allowed her, 7 months later this girl reappeared with full seriousness, I asked her about her engagement and she told me she was only using that to scare me away, that she wasn't into any relationship, I started loving this girl, I loved her so much so that the thought of seeing her made me restless @ work, it was a distance relationship so I hurriedly applied for casual leave, got it and headed home, thinking I av finally found my missing rib, I took her to
introduce to my mum, after my leave I returned back to work, that was last month end. About few days ago, one of her male FB frnd sent me a frnd request, this guy started tagging me in all his pix she commented on, in fact! They were couple, they got engaged to each other since 2012 and since then they av been flooding FB wit their love comments, wen I asked her about it she wanted to deny but wen I sent d screen shots of all dia comments, she cudn't deny again, I then called off the relationship and she accepted, my people! My hrt is shattered, that was d first I formerly introduced a girl to my mum, wat will I tel her if she ask of her? I feel bad, I feel cheated, am extremely hrt broken, abeg wetin I go do? N/B; it's like d guy has been d one sponsoring her education, she is now in her finals