You talk about GALing to fill the time, and that's just fine. If you force yourself to get out and do things which you enjoy, one day you'll find that they're not just time-killers any more: they're valuable parts of your life. It's just like when someone dies: at first you can't stop grieving, to the obliteration of everything else, then you start to reclaim parts of your life, but your heart isn't in it because you feel guilty for enjoying pleasures which your loved one cannot, and then one day you find yourself laughing and realize that the holes in your life are healing. You may be on autopilot now, but keep up with your friends, hobbies, etc, and they will help to normalize the texture of your life.
And it's a great thing that you can sometimes laugh at your situation!
You asked about whether to meet with him. If you do, it's important NOT to have any kind of relationship talk, just to be his friend, and the confident, happy girl he fell in love with. If you're not ready for that, I wouldn't recommend going. Remember: any kind of relationship talk is going to confirm his decision that he had to leave you, so if he does bring it up ... gracefully steer the conversation in a different direction.
You're quite right that you are NOT the reason for his MLC. At the same time, we all have issues stemming from our imperfect childhoods, and the rule of thumb seems to be that we marry people carrying about the same amount of baggage as we are. So, while we wait for the MLCer to deal with his issues is the perfect time to begin exploring how to deal with our own baggage.
I can guarantee, if your H was to come home tomorrow, but neither of you had done any work on yourselves, it would only be a matter of time until he left again. So, look deep into your fears (why do you feel so strongly that you "need your MAN back; nothing can replace him"--what is that about?). Look into your insecurities (why were you jealous of his relationship with his daughter?). Look into the connections between your family of origin and your marriage/other parts of your life (is there a connection with the fact you were attracted to an older, previously married guy?) I have no idea what your issues might be--these are just suggestions based on the few facts you shared.
In a way, the time given to us by a partner's MLC is the best gift of our lives because it gives us the time and the chance to deal with all our baggage, so that we will not have to drag it with us into that renewed relationship (or into our next relationship, if that's how things work out). However, that's not what it feels like right now. So, for now, keep reading the information on MLC offered on this site, read the situations of others dealing with an MLCer and gain insights and support from them, and keep your sense of humour!
