i need advice!!

so my boyfriend and i have been together (officially) since march but we started seeing eachother in january. we're still together and i've noticed sometimes i get the urge to say "i love you" but we've never said it to eachother. usually well say "i love us" or something along those lines. he told me that two girls have said i love you to him but he's never said it back/has never been in love so i'm afraid if i tell him i'll get rejected and i don't want that to happen. do you think i should wait till he says it first?