How do I not let this control my every thought?

[Travis]

doodles,
if it makes you feel any better that is true.
this is my second marriage. my first wife, basically, just gave up after less than a year of marriage and our daughter. We were high school sweethearts, found our way back to each other, she got pregnant, we got married. she is and always has been very needy. we dated off and on since we were in 5th grade. i always knew it wouldn't work, but don't think i could've ever had a relationship without knowing tha it didn't work out with her. well, it didn't. basically, she just said, "i'm not happy", and left. i still deal with her on a regular basis. we live in the country and she's only five miles away, with my daughter and her 3rd husband.
my current wife has been like a mother to my daughter, she even called her mom, and her biological mom was fine with that since my current WAW was such a great person. now this has happened. my daughter is 12. i've been pretty honest with her about everything since this all started. i've told her i won't volunteer anything i don't think she needs to know, but if she asks a question i won't lie to her. today, we sat around and talked a lot about it. she asked a lot about when me and her mom were together and i told her the truth. she laughed, knowing how "high maintenance" her mom is and knowing i'm just an old country bumpkin that just goes along with the flow. i was very honest about her mom and me, not in a mean way, and my daughter said she expected as much. me and my first ex are friends, i guess you could say. we raise our daughter together and as long as i let her think she's in control all the time things go pretty smooth.
my point is, sorry i'm always long-winded, my daughter told me today that she's been thinking about telling her mom that she wants to come and live with me. i've put up with a lot of crap over the years with her mom and bit my tongue more than i wanted to because i knew in the long run my daughter would always find the truth and respect Dad for the person he is.
I'm having a hard time with that as far as my WAW right now. the first wife was a year. current is 11 years of together and then she leaves me for OM she has known less than three months. this one's a lot more painful and i'm a lot more bitter. but i'm trying to remember how much my daughter thinks of me in the long run and knowing my boys will to.
if we keep doing the right thing, we will be able to live with ourselves in the end. don't know if WAW will be able to say the same. some days it doesn't seem to make it any easier, but i totally believe it to be true.
good luck to you and your sitch.