I need some advice. I normally don't browse /fit/ but here

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I need some advice. I normally don't browse /fit/ but here goes:
My roomate has been trying to get swole for a long time now, but was seeing almost no results and he was pretty depressed about it, so being the good buddybro that i am i decided to help.
I googled around and found this thing called creatine, which is by what i read, cheap, very effective and super safe. I didn't wanted to simply offer it to my roomie straight out because i was sure he would refuse any "juicing" (even though creatine is no juicing by what i read)
So every day when i fixed us something to drink during the day, i would add 10g of creatine into his drink (it's tasteless so you can hide it easily) the package said the dose should be 20g/day but i did half that just to be safe.
I was doing this for about two months, and covertly asking from time to time how is the gym going and he said it's a bit better, so my plan worked hopefully... but lately he has been complaining that he is getting this horribly painful spasms all the time and i am not sure if it's because of the creatine or not, so i am asking you..? Should i stop slipping it to him, or is it not the cause? I for obvious reasons can't admit anything to him about it.