How to end a relationship?

I have been with the father of my children for 7 years now… we are both in our mid 20s we have two beautiful daughters but over these years I feel like me waiting for him change it feels like my feelings have changed… before i felt like I would not make it without & that I would die without him but now that I’m getting steady on my feet it’s different I really do love him very much but I rather we both move on to start living we only know each other… how do I break it to him I’ve tried before but he just doesn’t get it …?