Love that dies

They feel the other more secure than current one. Because current one cannot produce a securing like past time before.

i think it is simple. the love between you is not exist.someone new is certainly as good as old one.but the new one fit better.

I'm going to look at this very scientifically. When you first meet a person you're attracted to, you get a rush of adrenaline to the brain. Your pupils dialate, everything turns brighter, everything seems happier. Every time you see that person again, you'll have that same reaction. When you form a bond, your brain sends those signals for 3 years. After that, your brain stops sending the signals. If you haven't formed a deep, meaningful bond.. you won't have a healthy relationship anymore. That's SUPER condensed.. hahah.. but it's basic. If it's before three years, it may be that the bond wasn't deep enough already. They could have found someone new or they might not be ready for the relationship. It can be a lot of things.