Am I overreacting?

So my boyfriend and I have been having sex everyday since Wednesday the 5th or August. He took a 10 day hard pill on the 5th. He nuts everytime we have intercourse. Well tonight we fucked and we tried every position for atleast an hour and he couldn’t bust and his dick went limp.? I’m confused is this normal? He said he hasn’t taken anymore sex pills since Wednesday. Could it still be in his system and affecting him ejaculating...? He has not jacked off or took any more sex meds. He is trying to blame it on me that I could be cheating on him is to why he didn’t bust... I’m not really sure what is going on. We have been having sex about everyday since July 16th and we’ve never had a problem, until he started taking those 10 day hard pills..