Should I fix my car? Can cars last over 200,000 miles help?

I have a Jeep Patriot for 6-7 years now and has 200k miles on it. I got a new car which also has many miles but less on it. But my bill with the insurance is too costly and I need return the car to save money to move out. My parents live in a. Senior apt 1 hr away from my job & im tired of driving so far I almost crash various times. No I won’t quit my job as I hate the city my parents live at and I like my job.
my jeep needs the catalyst converter fixed, and engine oil leak, I don't know if my car will be perfect after that. I plan to stop driving to Parents house daily in the freeway and live 10 min away from work. And live my life at 28.
I want save $5k for next year buy a newer used car in cash as that’s same price I got this car for and it lasted me a long time.
I also have option live with a guy that is almost my boyfriend , but he lives 25/30 min away from my job and his city has a lot of hills and I worry if my car will give me smooth rides even if I fix it.

Should I fix my car? Can cars last over 200,000 miles help?
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