Well, focus on your girls and yourself. It would be nice if he could take the younger girl out to dinner once or twice a week. Could you get him to do this? Convince the younger one that both her and dad could benefit from special time together. She still needs her father and maybe you can point out that parents aren't always perfect. Dad is going through a difficult time in his life. You could even talk about different stages of life like MLC, and even through not all men go through this in the same way, some do and they need time and distance to figure their lives. Also, aging can cause depression. Having some special time with the kids might help his depression. Even if when we don't know what's going to happen and where the future leads, it's good to try and stay somewhat together as a family.
The 18-year-old is an adult so she can make her own decision when and where she wants to see her dad. It may take her awhile, but hopefully she'll learn to forgive him. The hardest thing is the kids and I know from being there myself as a young woman (my parents were divorced), and then seeing my own kids go through it. I'm also seeing it with friends. It's painful to "lose" a dad. So the more you can keep him in their lives the better for them. Flaws and all.
As for yourself, you just GAL and take care of you. Disconnect from him, don't contact him, and just move on with your life and be as positive and nice as possible. Have you developed any interesting hobbies? Considered any great vacations for the spring and summer? Start planning an AWESOME summer for yourself, with your daughters, and maybe a "girl's" trip to Vegas, or somewhere else, with some girlfriends (let the 18-year-old watch the younger one for a few days).
There is no arriving, ever. It is all a continual becoming.
