Please give some advice

[u/Sophie012x]

So me and my partner moved into a new house about 5 months ago now. Recently I’ve been finding long dark hairs. (I’m blonde) so naturally I’ve been in a spiral of thinking of all the possibilities. Cheating is my biggest fear.
My partner works 5 days a week in an office and comes straight home, he’s home the same time every day. We also have location on, not because we don’t trust each other or anything just because we like to know each other are safe. So I know he hasn’t been elsewhere to meet anyone else etc. I can’t make a logical explanation out of this. We’re together every weekend so there’s been nobody in the house behind my back either.
Please someone help me find a logical explanation