A dilema

Hey, I thought I would use my first post to ask for some advice. Now bare with me I'm quite tired as it is almost midnight when I start this and I've been working my ass off all day (even though it's mothers day.. or maybe because it's mothers day) so dont mind the misspelled words and poor grammar.

I will give you a little background information here to set up my dilema.. I have 2 very close friends, although I'm closer to the female friend more than the male, that are married. They now have 2 girls (the youngest is almost 2 months as she as born late October) and the oldest is 4 years old. I have known these 2 for about 12 years and I have always known them as a couple. They were married in 2003.

Well quite a few years ago he was caught writting emails to a female "friend", but the content of these emails I guess were a little on the racey side. I dont know what they entailed but she was quite upset with them. She asked him to stop having contact with her as this "friendship" was making her uncomfortable. Mind you He and I can have a little flirtaeous (sp?) banter and that has never made her uncomfortable as we always did it out in the open and it was very apparent that we are just kidding around. So she is not an overly jealous person. He has been caught a couple more times contacting her and she (my friend) has always confronted him about it and he swears that he wont contact her again. The lastest time was just a few weeks ago, he was caught texting her and she confronted him about it and he wound up in tears saying he didnt start the contacting that he just responded and he actually stopped responding to her days before he was found out.

Well I found out today that my sister has seen him together with another woman at the movie theaters here in Racine about 5-6 weeks ago. She stopped to talk to him and he seemed a little surprised and on edge ( according to my sister). According to my sister my sister in law has also seen him together with this same woman at the theaters 2 other times (mind you I havent spoken to my sister in law so this is just hear say, but I do believe my sister)

So now I sit here at 10 past midnight not knowing what to do with this information. I dont know if this woman they saw him with was this woman that he was asked not to contact anymore or someone completely different or maybe a relative (but that seems doubtful as we have met most of his family and I would think if it were someone that he was close enough to go to the theaters with I would have probably met them) Why would he go to the theaters without his wife and with another woman? but then again if he was screwing around why would he go to the theaters in Racine where there are a lot of people that know him?? I'm all for men and women having platonic relationships but I also think that the spouse should be well aware of everything they are doing together. I dont know if my friend is or not... I do feel it's my friends right to know if there is something going on. These days you really need to know where your significant other is as it could cost you your life if they were to bring something back to you.

So I guess I'm just looking for a little advice on how to handle this situation. I really dont think I can just sit back and act like I know nothing.. I really wish I did know nothing, but know I know what I know and I have to do something.. but what... so please, any perspective you can give me.. thanks.. and I apologze that my first post is something like this.. not as interesting as other posts, I just dont know what to do with this. and I'm not going to proof read this as I must go and take my booty to bed as I have 2 daughters that will be waking me in just a few short hours.. I await your responses.