No 2x4s here! I don't think there's anything wrong with unfriending your daughter so that you don't have to be exposed to hurtful reminders. Two of my three adult child chose not to friend me - whether they wanted privacy, or were afraid of what they might see on my page, or wanted to protect me from accidentally seeing their father's posts, I don't know, but I'm fine with it. The one who is my FB friend is the one who hasn't spoken to his father for almost two years, so I don't have to worry about accidentally seeing anything about my ex. If she asks you why you did it, just explain that it's nothing to do with her, you just prefer your privacy from ex.
As for not worrying more about him - it's not your job anymore, is it? You've been fired from that job. Karma does have a way of dealing with them, sooner or later. Not your circus, not your monkeys.
And as for the musician? I know a lot of musicians through my professional musician best friend that I sometimes play and tour with. The music business today is terrible. Somewhat famous middle aged musicians who should be living off the royalties from their past hits are broke - thanks to the completely inadequate internet royalties from Pandora and Spotify (way less than radio royalties, shockingly low). And the only musicians that I know that are actually making a decent income are touring constantly in order to do so. So unless you are in great financial shape yourself, and willing to semi- support a partner, I'd steer clear of musicians unless you can establish that they are financially stable.
Don't get me wrong - I love musicians and wouldn't be opposed personally to a relationship with one. But I have a secure financial plan in place and even so, wouldn't take on a musician with debt or financial irresponsibility.
