Advice

Had a conversation with my bf the other day which led to talking about if we had ever gotten tested (STI and whatnot) I Personally have , so I replied by telling him why and all that stuff, when I got to asking him he told me he had never gone as far as I know he's had 3 partners other then myself. This kinda made me uneasy as I've been feeling a little off off down there every now and then. I'm also usually over paranoid about things. I dunno if I go and get check and something is wrong how I'd talk to him about it :/