On Again....Off Again, That Darned Ex Of Mine!

After feeling like something wonderful has been accomplished (him showing up to our daughter's graduation), our daughter started feeling like her dad was showing some interest in her life. Father's Day was yesterday, and I happened to mention to her about calling him to let him know that we had pictures to give him. She did, but I guess he's back to his old ways again....he didn't even answer his phone. He doesn't work on Sundays, and he always leaves his phone on, and basically, with him at all times...so why didn't he answer?  My guess is that he was with his other woman, too busy with whatever, that he just didn't answer. I think at this point, I just want to throw my hands up in the air and give up. I do not feel that I should call and ask him why, nor should I call him today to see what's up. Perhaps this is just one of those times that we need to leave things as they are, and accept that he does what he wants to and when...guess it was good while it lasted...right?