Well, never seen this one with a male bull before

This is a strange one and I cant wrap my head around it so I need some good advice. Most of the guys Ive dated have been Taurus. Im a Leo gal with Pisces moon and it seems to be a good match. I have a Taurus man Ive known for a year living in my city, we dated casually mostly friends. He left behind in Paris a Cancer Leo moon girlfriend who has pulled some of the most extreme stunts Ive ever seen to get his attention. Example: They had broken up and hes here and she went on holiday with his sister, posted pics on FB, posted hundreds of pics of her on their male friends laps, hugging and kissing them with her holding the camera. While he was here she wrote nonstop posts on FB like:Life is soooooo good, I just want to scream sometimes Im so happy, a smile is the answer to everything etc stuff that would make you want to puke. This girl is 32 years old. Now she is physically very unattractive but even stranger she acts and looks and dresses like a 5 year old child. Barrets in the hair, puffy sleeved baby doll dresses, no bra and she is covered head to toe in freckles and has extremely chubby cheeks. His fiends told me hes not happy with her.
Whats very odd though is when hes around me he gets very Taurus style jealous if any guy pays me attention, however his girlfriends antics did not register with him at all. Remember these pics are public, everyone can see what a fool hes being made. Few guys would put up with this behaviour, Taurus guys...no way. My question is why no jealousy for her crazy stunts, why jealous over me and nothing and for heavens sake why oh why does he stay. Im moving to Paris soon for work, hes super excited yet hes still living with her, still faking it, still going on holidays with her.