Without a condom my vagina had no discharge or smell with my ex

But with this new guy I notice I have discharge and a light fishy odor he got tested and he is negative on all Sti’s so I don’t know why my smell has changed down there

The same with this other guy I used to sleep with 5 years ago he would give me yeast infections with or without protection which was weird

So my question is has anybody had different smells and fluids with different guys?