Perhaps the greatest sign of bed bugs is their bites. Whether it be every night, or every week or so, if you are getting bit consistently, it’s almost a guarantee that you have bed bugs.
You can look up bed bug bites on google to see if yours match, but be aware that everyone reacts to bed bug bites differently, so there is no right answer for how bed bug bites look, or the formation of their bites.
Interesting fact – most people don’t react to bed bug bites initially. They will eventually develop a reaction to them, but yes, your partner is getting bit by bed bugs even if they aren’t reacting!