Hi there.....it is common in a marriage for there to be some changes in terms of passion and interests over the years especially as kids come into the picture distracting a couple from one another.
Facebook is a great thing, however, it has also been known to lead to emotional and physical affairs and led to many marriages breaking up.
It is easy to succumb to the excitement of reuniting with somebody of the opposite sex who is more readily available to give us the attention we crave during times when our spouse isn't able to.
This ignites those butterflies that emerge when we feel attracted towards the attention the other is able to give us and you need to be aware that this is something that can easily pull our efforts away from perhaps re-igniting those feelings with the one who we first committed to.
Have you tried to work on renewing some of what you and your wife had that seems to have slipped away???
Like having date nights or making time to be with one another???
I bring this up only because those butterflies you feel, as exciting as they may be, are there in the now but if you were to spend 6 years with another person the reality is that those butterflies will lessen throughout the years, not to say that you don't love that person but love matures over the years as time is spent with a spouse and you build a life together with family and distractions....good times and bad, sickness and health, in-laws and money problems, children etc.
Just wanted to add a dose of reality to the situation of how things may appear to be wonderful with somebody you reconnect with who is a welcome distraction to the reality of life and how easy it can be to see the grass as being greener on the other side of a computer screen when in fact it's probably just the same grass you've been standing on, just in another part of the yard
Anyway....no judgements here, just thinking that there may be a way to put those energies into perhaps reviving what seems to have diminished in your marriage......love is like a garden that needs tending to.....if you don't take care of it with some tender loving care, fertilizing and watering the weeds can take over.
Or like a car it needs regular maintenace in order to run well.
I hope some of this helps and allows you a different perspective on what may be happening.
In any case, I hope that you can find a way to find the happiness you deserve.