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Re your question, The front glass and digitizer are fused together and it is very difficult to remove just the front glass. You may damaged the digitizer in the process, but it is possible to replace it. I've found a Youtube video showing this --> https://www.youtube.com/watch?v=PfJ2ap2pmgo
If you tell me the color of your S5, then I will find the part and tools for you
Here is one from eBay.com --> http://www.ebay.com/itm/Samsung-Galaxy-S5-G900-Front-Glass-Screen-Replacement-Repair-Kit-BLACK-/281730648503?hash=item41987489b7:g:ZmUAAOSwPcVViZPj
You're most welcome ! Here are the instructions if you want to replace the entire screen (including digitizer)--> https://www.ifixit.com/Guide/Samsung+Galaxy+S5+Display+Assembly+Replacement/26914
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You're most welcome !