If you both still have busy schedules, he may be wondering why things have changed all of a sudden.
This is why he could easily blame himself or think it’s him whenever you don’t want to have sex.
You may have to ask yourself about why your period, being in a bad mood or a desire to just settle down and cuddle wasn’t an impediment in the beginning of your relationship when the both of you were having sex like rabbits.
Perhaps, something within the dynamics of your relationship has changed that you may not be acknowledging at the moment.
In other words, when you are not feeling sex, it may not always be because you are on your period, in a bad mood or just want to settle down and cuddle.
Yes, these reasons may seem to be what is causing your reluctance on the surface.
However, there may be something about your relationship with him that has changed since you both got into a committed relationship.
Again, in the beginning of your relationship, you seemed to be able to have sex wholeheartedly, despite your period, mood or desire to settle down and cuddle.
Hence, there may be something else at play here that you may not be considering.
The sooner you figure out what that is, the sooner you will be able to address this issue with your boyfriend in a way that he will be able to understand.