hi guys
i got a baby degu last week to keep my 8 month old male company. now he was reaaally happy, tame and friendly towards me before we got the baby but since we introduced them together (they are now best of friends,. were straight away infact after their gradual introduction) the older one will shirek at me if i go near the cage and runs away to his bed hiding after a minute. sometimes he is fine and lets me scratch and tickle him like he used to but it is very upsetting when he goes the other way.
like this morning i got up and went over to their (MASSIVE) new cage that i got with the baby and squeaker (the 8 month old) started roaring when i went near him, and let out a string of sporadic shrieks for about 2 minutes.

what can i do? is he jealous? protecting the baby degu?