Sti’s

My previous partner is guilt tripping because he thinks he has an sti. And I don’t know how to feel I’ve been careful. And now I’m super embarrassed and idk how to even feel anymore. I feel like a whore but how do I know he didn’t have it before but I don’t wanted have to say I’ve had an sti. He hasn’t even been to a doctor and I don’t have the money to go get checked because I don’t have insurance