Unfortunately with the Nexus 5, if you crack the glass you have to replace the entire screen (some phones you can just replace the glass and not the digitizer)

Here's a video on how to do it:


Here's the part: Amazon.com: LCD Display Touch Screen Digitizer with Frame for Google Nexus 5 LG D820 D821 with free tool: Cell Phones & Accessories

Slightly cheaper part: http://www.amazon.com/gp/product/B00...celphofor0d-20

You can go to repair shop, but I think the screen replace is quite expensive.

I somehow cracked the screen on my Nexus 5, it was in my pocket at work yesterday and when I pulled it out it was cracked but still worked. No idea what happened, probably bumped into something while walking around. Today at work it became even more cracked and the screen just had rainbow colored lines all over the place. My common sense is telling me that the answer to this is gonna be "no", but is there any way to get it repaired instead of getting a new one altogether?