Nothing will change in your life until you stop reflecting on what you've lost and start looking forward, creating something new, forging a place for yourself in your future.
It doesn't matter if you've lost a job (a lot of times, it's an enormous blessing and is the universe giving you the push you needed to get out of your complacency rut an into what you really want to do). It doesn't matter if you're newly single, in a new town or you've been forced by some other means to make a change.
You ARE NOT your past. Your past decisions are not the decisions you will make in your future. Your past self is not who you are right now nor who you'll be five years from now. You cannot move forward if you're forever looking back.
Focus on moving forward, focus on how this change affects your current situation and what you need to do to make it work for you. Change isn't something that 'happens' to you. Change is a cause and effect from your own actions and not looking at the broader picture.
Always look forward, always have a plan and always have a backup. Change is a glorious and liberating thing if you'll simply open yourself up to it.