Personal question

So bit of a out there one but I’m a bit of a over thinker So my fiance has suddenly started going soft half way through sex like out of no where his work means that he’s away Monday-Friday sometimes longer (military) and this has never happened really but now it’s happen multiple times in a row and this is a man who used to get hard at just me getting dressed should I be worried? Because I’m well and truly overthinking over here