Relationships

Does people's thoughts and feelings really change in time?

I have a girlfriend of 3 years now. Everything's perfect normally, but we've had some rows in the past. She took space many times (at least 3 times) because of our arguments and etc. I was the one who always reached out after 4-5 days. Because of my love etc. I know I shouldn't of maybe, as it's a space request and I am violating it somehow. But like I said, out of love and impatience. Anyhow. My question is this. The times we had spoken about everything, once I remember asking her that what would happen if our relationship ended one day? Wouldn't you ever think to reach out? (I ASKED THIS BECAUSE LIKE I SAID OUR RELATIONSHIP IS NEAR PERFECT NORMALLY). She said, I'm a very stubborn person, no matter how much I love you, when it's over I'm done. I don't look back. I may regret but that's how I am, even if I regret, I will never.
So basically I wanna know, if after all the relationship in general is great, and you have so much love etc. Don't they still come, or won't they even try?
Does people's thoughts and feelings really change in time?
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