His whatsapp privacy is set to contacts for his LAST SEEN. So only his contacts can see his last seen. When he had not saved this girls number in his contact list, he opened his privacy settings from my contacts to everyone. After he added her in his contacts, he set it back to my contacts. He has not done this for anyone.
She used to study economics and recently he was spotted standing near the bookshelves which has economics books (his own subject his philosophy). She saw him there so he left quickly. It was so weird because he was kind of looking uncomfortable yet smiley whilst standing there.
When he spoke to her, he wanted to know things in her personal life and he asked her twice. He also keeps telling her how he wants to go on 1 or 2 weeks break which I don't understand why because he spends some weekends with me but doesn't talk about 1 or 2 weeks break.
Once, she was talking to him about her tutors and she asked him if he knew her tutor who wears a beanie. He said he did and a few days later, he wore a beanie himself.
She stopped texting him when he left her on read and he is very resentful that she won't text him again.
What does all this mean? He texts me a lot, go out to bars and pubs, we spend weekends sometimes and we have a lot of sex too. Then what's all this?