If a guy has always been the one texting first and stops?

This guy once mentioned that i don't talk to him at all. We've been talking for a few months and he has always been the one to text first. But it's been three weeks since he last texted so you could say we didn't talk since the year started. I'm now conflicted whether or not to contact him first, because i'm not sure if he might have lost interest or he got tired of always being the one initiating? I'm assuming since he didn't contact me till now which is already two weeks into 2015, he might no longer want to continue talking anymore?
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Hey guys thank you for all the helpful responses! I did text him earlier today but his replies didn't seem enthusiastic or anything. I know i can't just interpret as that since its hard to tell but i take that as a hint so i guess he has probably lost interest. Its kind of saddening but im moving on too then :-)
If a guy has always been the one texting first and stops?
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