Yes, and you should go in with clear eyes about it.
First, stop trying to entertain him around the clock. It is not possible, and more importantly, it is not your job. What is happening right now is a test, whether conscious or not. He is gauging what you will do for him, how far you will stretch, how much guilt you will carry. That dynamic is extremely common when someone is incarcerated, and it does not mean he is a bad person, but it does mean you need to set boundaries and hold them.
Your life outside has real financial and emotional demands. Budget for yourself first. That is not selfish, that is survival.
As for meeting people, inmates have more avenues than most people realize. Mail, JPay and similar email platforms, pen pal services that actively recruit people on the outside looking for connection or more, and the daily social environment of the facility itself. Inmates have all day and all night to think, write, and work those angles. They get very good at it.
None of this means your trust is misplaced. It means you should extend trust with awareness rather than anxiety. Know what the environment looks like, set your boundaries clearly, and let him operate within them. A relationship that survives incarceration does so because both people are honest about the reality, not because one person exhausted themselves trying to fill every empty hour.
Take care of yourself first. That is what makes you someone worth coming home to.