chatting

Q: I want to ask if it is permissible for husband to talk and chat with his cousins daughter who is around 21 year? They talk several times' daily and he assure me that he cant marry her but still Im worried as i have read his conversations and he asks for her pics and want to talk on phone with her. He also want to open academy and want her to work as a teacher there as she is looking for a job. We live abroad, but i don't like this frequent chatting between them. So i want to know, is this 'friendship' a sin and haraam for my husband? How should I confront him?

Q: Is it permissible for a husband to continue a friendship with a girl? 

Q: If my husband speaks to his female cousins or friends just to keep a good relation and friendly chat but I don't like it and I don't like such conversation. What should my husband do as he thinks I am over possessive and he is not doing anything wrong.

Q: My question is that if someone is getting engaged and he she want to chat, is it permissible for the both and if not then is their any other way?