<human>: Me and my ex girlfriend were together almost 4 years back in college through early university. 
I loved her without a doubt.

Been with new girlfriend about 2 and a half years, and all I can think about is my ex. Since about 6 months ago I've realised that saying 'I love you' to my current girlfriend just doesn't feel right. It doesn't help that as a male in my mid twenties my emotions have severely dwindled for most things going through depression etc . 

So I'm not sure if being of this age, this time into a relationship I should feel kinda dry about everything.

Problem is, my current girlfriend is perfect. She likes video games, she's smart, kind, gives me space, doesn't moan about anything. But I'm just not happy and I have no reason not to be.

A few months ago my nana died and, during her last moments I saw her with my grandad, I thought about my ex girlfriend.

Should I be breaking up with my current girlfriend knowing that my ex is always on my mind?

Can you provide a brief overview of the text?
<bot>: can't get over my ex, not sure if I love my current gf, do I break up with her?