Some men just think that you know.  There is an old joke that says, " hey, I told you that I loved you when we got married,.  Her reply " that was fourty years ago.

It is very to say " I love you " meaning it is something else.  Maybe he is afraid of commitment, or maybe he doesn't love you.  Write down all the good things about him, and all the bad things about him.  I'm assuming that you have sex ?  How does he behave, maybe he is married.

I know that that's the last thing you want to hear.  Check out all the possibilities.