No I love you?

We've been together 6 months, official for 3 months.. And still no "I love you's" have been exchanged. I feel like he shows it in other ways.. How long do this things usually take??? He's 27 and  his first girlfriend. He usually only had flings.. So I know it's probably harder for him.. I'm 27 as well and if he's never going to feel that for me id rather know so I don't waste my time.. What do you all think?