Trusting after betrayal?

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I am married for 13 years and has son. Like other marriages, we have ups and downs. He has been my "world" for the past 15 years (including 2 years of being bf/gf before marriage) of our relationship. I have good relationship with my in-laws and so is he to my family. My husband in working in a multinational company based in Japan. The "storm" in our relationship came last quarter of 2012 when he stopped communicating with me. I did my best to communicate with him by all means but he won't take my call. After a month of trying, I got an offline message from a certain yahoo ID telling me that she is my husband's mistress. I was in denial because I know that my husband won't do such thing. I ignored the message then one day, an unknown number called me. It was a lady. She ensured that she was speaking with the right person and I was told she's having an affair with my hubby. They just met online and she said my hubby won't come back because they will be living together when he came back in our country. She also said she will do her best to get along with my in-laws particularly my mother-in-law (who's proven to "like" anyone who can give her money). It seems like this woman knows all about my in-laws personality and "history". After that incident, I confronted my hubby and told me he got nothing to do with it. As a woman, I trusted my instinct not to believe him. He became thoughtful again and communicating daily (that's the normal him) Few weeks passed, I saw a facebook account added to my sister-in-law. The profile photo is of a woman together with a cropped photo of my hubby. As expected, I freaked out and asked my sis-in-law about it. I was told she just accepted the friend request. I wonder why she didn't even thought about rejecting it. I told my hubby about the facebook profile and he finally admits (after telling him I won't stop digging) he had a short term "online affair" with a woman she met in one facebook groups. There are a lot of questions needing an answer as to how the lady got my number and yahoo ID. Why is she bothering me? Why she got those guts of telling me that she's my hubby's mistress. Even if he asked for forgiveness, I still can't trust him again.