Why is it so hard to forget your first love?

It's hard because that person was the very first person you ever loved so much,you cared about,the only one you trusted etc. That person was the only one you thought your going to be with for the rest of your life. People might say they don't remember their first love but they always have a memory of them like a first kiss,a soft touch on their body,the way they treated each other,the way they made each other feel etc. A first love will always be with you, even if your with someone else and you love that person more than you ever loved your first love but it will always be with you