Not as hard as he used to be.

So me and my boyfriend have been having sex for almost 2 years. In the beginning he would get really hard and last s good while!! Now he goes soft really quick and still doesn't get as hard as he used too. Any advice on how to get that back?! What could it be? He's 19 so he's young and he's healthy.
Edit: he claims to not jack off much. I don't think he does either. It's not him. I'm sure he does if we don't see each other for a while. 
Also, we have been getting thru issues the past 2 weeks but even before that he had this problem. 

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