How do you handle leaving your pets?

I'm going off to training soon and I won't be back for a long time and my cat I've had since I was 8 is getting old so I'm trying to cope with the fact I might not see her again and that I feel guilty for leaving her behind so I can go on with my career. I'd be leaving her with my parents but I know even though they'll take care of her it wouldn't be as much as I do.
How do you handle leaving your pets?
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