She’s saying in these messages she wants to be involved, but saying it is one thing, if she hasn’t actually turned up to anything, then how long can you wait. He keeps the door open by basically saying there’s not enough time now for you to be completely involved but we can work something out.
Obviously we don’t know the full story here but BC doesn’t really owe Darcy anything, yet he is offering her the chance to: a. make alot of money, b. being back in a stadium rock band. Again I don’t know Darcy’s situation or what she’s gone though/going through but that’s probably a lot better than anything else she’s got going on. She repays him by not showing up to anything and then posting private messages online.