Letting go of past clients

I work full-time in a job I don’t enjoy, and part-time trying to build a business that I’m extremely passionate about. Recently I raised my prices in my personal training business. I normally have around 2-3 clients at any given time. After raising my raises (by almost 100%) one of my clients was happy to continue working with me and paying me twice as much while my other client told me she can’t afford me. I should be happy since I’m earning the same amount of money for 50% of the time commitment. However, I can’t seem to let go of the guilt of leaving one of my clients on her own. I also find myself thinking of ways to win past clients back. Why can’t I seem to be able to let go and move on from clients who no longer wish to train with me or can’t afford my services?