Should I finance a new car?

I currently have a 2018 Nissan Altima at 90,000 miles and have $1,000 left on my loan. My boyfriend is pressuring me to trade in my car and put it towards financing a new car. He says my car is known to have transmission problems at around 100,000 miles and I should trade in my car while it's still worth something.

However, I worked hard to pay off all my debt, and I'm hesitant to finance a car and have a $400 car payment. I figure I can keep my car and if it does break down soon, I can easily finance a new one without a trade in.

Opinions please?