This is a typical behavior of inmates in general. It might be the relationship, or it might just be him - and not that he is seeing or speaking to another woman but oftentimes they get depressed and disconnect from people they love. There is a perception on the inside that the outside world has forgotten us. We would give it a little time, maybe write a letter and address your concerns. He might be feeling helpless and lost, OR he might be having many women contacting him - you know him better than anyone. Trust your instincts.