Why does my boyfriend not get jealous of me or make it obvious but was clearly possessive over his ex?

Anonymous

My boyfriend doesn’t show his jealousy or traits of this when with me but when discussing his ex it was clear that he was very jealous of her as he would try to tell her to not speak to certain people or get jealous when guys spoke to her he said it was because she was young and stupid so he tried guiding her correctly but at the same time said she was a bit showy (nice physique etc in his own words) the thing is I’m not a ugly girl but she could be better than me or maybe I feel this way cause of the way he worded her. He has no connection with her at the moment but just the idea that he was like that with her and this way with me … why could this be and what can it mean

Why does my boyfriend not get jealous of me or make it obvious but was clearly possessive over his ex?
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