Ew! No one could get me to use their toothbrush...! LoL
How he did it may mean something? Like if he said..oh hey there's a toothbrush in there for you now...then it may just be a practicality issue.
If he did it like my boyfriend did, it may mean more...he excitedly called to let me know he got something for me...and when I came over, he couldn't wait to show me..even saying "its your favorite color too!" Not long after, he encouraged me to bring over any things I prefer to use so for when I take a shower and stuff and cleared a shelf for me. For him, it was a huge deal cause he wanted me to know he was sharing his space with me.