The good thing is that he never done a runner as you opened the glass door.
You could possibly introduce a female of the same age but you may need to separate as they get older.
2 Bearded dragons ( Jaffa and Queenie)
Lime Green Preying Mantis ( Gretna) RIP
Siamese Fighting fish/Betta ( Bertie)
Whippet cross Staffordshire bull terrier ( Brind)
Green Horned Frog (Norman)