Should i be worried???? 👀🤕

Okay so for my birthday this year, my man took me to paris for our first cheap holiday together. (Im 16 n hes 17). We spent almost the whole holiday going at it non stop, and i mean it, we used 22 condoms in 3 days. 🤒 
When we got back we didnt see eachother for a few days. This is where it went wrong. I went round his house about 4 days after coming home, and we had a session. But it lasted alot longer then he usually does. So i carried on, waiting for him to finish because at this point i was just aching. 
All of a sudden he goes soft. WTF! So i say like dude whats up youve gone soft? N he pulls out, and he hasnt even finished! 
Should i be worried? Is my sex not good enough or is it the fact that wed spent 3 days constantly having sex...?