I have a couple of thoughts.. First, the whole "lack of connection" thing sounds waaaayyy too familiar to me. This is one of her excuses for having the OM. Think about a new relationship and the emotional high you are on.. That's not what a long-term marriage feels like but it sure is fun when it's happening,isn't it? So, while she is feeling this "connection" w/OM, she can't possibly feel connected to you! So, yes.. in a way - it's BS.

Second - you handled that discussion VERY well. You are doing great.. Let her talk and you be a great listener. Be her friend. Listen closely to what she is saying. Validate her feelings. Is there something else she needs from you that you could begin to do?