He is cheating on his long time girlfriend

Why yes, it is weird that this very very rich some time reality star with celebrity offspring is cheating on his long time girlfriend with a frequent yachter/very good friend/model of his offspring who supposedly has a significant other.

He knows she won’t leave.

This very rich part-time reality star who has been on many different shows is treating his significant other so poorly now that he is bringing women he is cheating on her with to the home they share whether the significant other is there or not. He knows she won't leave.

Reality show star has been seeing someone else very quietly

I don't know if this foreign born model former yachter who met her foreign born super rich betrothed as a customer will ever get married to him. The super rich former multiple reality show star has been seeing someone else very quietly the past six months and might be looking to make a change.