Yeah he has to keep contact quite rightly but no way should he be calling her stunning, its wrong wrong wrong, id love to know how he explains it. He is obviouisly worried now.
Ill also just add that when i found out some things about my partner and text him we need to talk, he did exact same thing, constant ringing me at work, texting to find out what it was,turns out he painced cos 2 weeks previous he slept with his ex.
Im not saying this atall has happened to you, just what it was with me.
On the other hand he may just be worried you wanting to end it with him and he dont want to lose you.