Do i have thrush.. should i tell him?

Get yourself some over the counter treatment that includes the oral tablet fluconazole and some topical clotrimazole cream. Your boyfriend will also need to treat himself with cream. He may or may not have infected you but if you had it then, he may well have got it anyway. Men don't usually get symptoms but they can certainly transmit it back to you. Thrush is not a sexually transmitted disease so don't be embarassed about telling him.