A: When was the last time we saw each other?
B: About 7 years ago.
A: What has happened in your life since then?
B: A lot of things have happened. My cat gave birth to 5 kittens, I got married, I changed 3 jobs, I bought a new car.
B: A lot of things have happened. My cat has given birth to 5 kittens, I've got married, I have changed 3 jobs, I have bought a new car.
My question is this: what difference is there between the two? Does the "I've got married" mean that I am still married while "I got married" may mean that I am no longer married, does "I've bought a new car" mean I still have it while "I bought a car" means or can mean I don't have it now? Anything else?