Someone once asked...

I miss my ex who i spent 5 years with from 20-25. she left because she felt exhausted but a year and a bit later I'm still reminiscing and in love. I also sometimes feel abandoned and deeply depressed

Someone answered with kindness...

That is normal, 5 years is a long time, and in your 20s that shapes a lot of who you are. Take time to grieve. Sounds cursi but really find yourself, do things you are passionate for when the time comes.