To be or not to be

Rosina-May
I had been with my boyfriend for 15months. Early on in the relationship he got diagnosed with cancer. And it put a lot of strain on us. 
I tried everything I could to make him happy.
 Once he got the all clear after five months. I started to notice he didn't do anything to make me happy. 
I told him I wasn't happy and things needed to change otherwise i would call everything off. 
The day before my birthday he decided to call everything off. We still speak because he still have check ups etc. But he's apparently still very much in love with me and I'm just not anymore. And I have no idea how to get that message across- because all he does is shower me with gifts and does things he never did when we were together. HELP NEEDED!!!!