cheated

hi im married for 8 years..nd i got an awesome husband,im blessed to have him,nd i added 1 guy in FB,he s my friends ex boy friend,but i never met him,only chatting.first he was very friendly only ,nd den he said he like me nd he love me ,so i deeply chatted with him for 2 years.nd after that he got married to hid girlfriend,after that i avoided him,bcoz my friends told me he s not a gud guy ,he used to chat with many girls(especially married women) ,to get something from them,nd its true only ,bcoz b4 marriage he asked me money,nd i said i dont have money ,after that he lost interest chatting with me ,so i also avoided him,after 1 year i opened my messenger,saw his messages,so i just replied friendly only ,den again started chatting with him ,,it went for somedays,,
and here is the shocking thing happened,we used to chat in whatsapp..nd i saw my neighbour nd he coming online same time .first i thought its an imaginary ,,but its true only ..bcoz obe day me nd my neighnour went out together,nd i gave my mobile to her ,nd went to rest room ,nd i forget to unlock my fone ,,at that time she checked my whatsaap ,but no wrong chatting in that ,nd after that she checked ,me ng that guy coming online same time .so may b she messaged him to know abt that guy,nd they started chatting,nd she s a very jealous woman ..she have 4 kids ,she checked my fone wen she was pregnant with fourth baby ..she can tolerate seeing anyone happy ,her husband lost job ..and my husband in gud job ..so may b she s very jealous of me ..nd i called that guy nd asked him weather u have any contact with her ,,nd he promised on her mother nd said NO..but i saw them both coming online at the same time from my another fone,nd i put status in my whatsapp .that u took my contact nd its shame on u ..but i dint name her .after 2 day sshe dint come in whatsapp..but i changed my number ...nd i dont have contact with both ..nd now she s not here in our building ..she went to her native ..nd now agian ,they both coming online..
so friend plz tell me wat i can do not ,,whenever i think of her ,,i got very angry ,,
plzz dont mistake me for this long post
its my life
wat i can do now