OP, I had a relationship for about four years. In the last couple of weeks, I felt really tired, would fall asleep on the sofa at 7.30 straight after eating. When we went to bed I'd be asleep within seconds. I was too tired to even notice the change in me, I was just focussed on getting through the day - school run, work, feeding us.
He didn't try to help, he just got arsey, complaining we weren't having enough sex, I'd gone off it, I was boring, mean etc. He went silent & moody then left.
The people who loved me realised there was something wrong and encouraged me to go to a doctor. They were right, I was ill (BC) and needed treatment. Two years down the line and fully recovered, feeling good and back to normal energy levels, I ran into him in town. He asked me over to his for supper. I said no thx.
He had made it absolutely clear what he cared about, and it wasn't me.
Dump your boyfriend, he doesn't give a toss about you, only what he can get from you.