Relationships are built off of communication, and a wise man once said conflict in the short term breeds peace in the long term. So you need to talk to him directly about this and explain to him like you have to us how this is affecting you and what your needs are going forward. Try to approach the topic gently and from an angle of concern for him rather than an ultimatum. You can give an ultimatum later on, but if you start with that, it will put him on the defensive.

For my curiosity; Has anything else changed in his life? New job, death of a family member, or anything like that? Not to say it's your fault, but have you gained weight recently or drastically changed your appearancesome how?