My boyfriends gonna move out! Why? Help! Please!?

I live with my father and brother. My boyfriend moved in about 3 months ago. He wrote a letter, to get out of a parking infringement, and asked me to post it because he didnt have time to buy envelope, It said he was "temporarily" living here and that hes "moving back with is parents next year" (for contact reasons, i guess). This is the first I've heard that its "temporary", im so confused! I love him very much and we work though all our problems. Please help! Any help appreciated so much!