The only way you can teach children healthy relationship is by giving them your self and a role model. If you and your husband live in harmonious loving household kids will see this.
This is where we disagree.
I think children are shaped by what they see at home, see from friends and peers, see from the families they know, from what they see on the TV, what they see in films, what society pushes as romantic and acceptable.
Which means if the messages across a lot of mainstream TV, film and media are romanticising unhealthy and abusive relationships by saying that disrespectful and controlling behaviour is actually a sign of love that's a problem.
It creeps into many other areas. For example, it used to be considered banter for boys to ping bra straps, or boys bullying and being unpleasant to girls was dismissed because he probably fancies you. Most people have moved past considering those as being acceptable behaviour from boys. Many films historically have pushed the idea no doesn't really mean no, if you push her enough she'll give in, she says no but she's just playing hard to get and I don't think it's a coincidence that attitudes at the time around consent were highly problematic. It's a vicious cycle where films reflect what society considers acceptable, whilst also setting the standards that people think are acceptable.
If teens are watching films where the adults are saying "aww Edward really loves Bella" and the film presents his behaviour in a positive way, and it's all romanticised then that's a lot of messaging to girls that this sort of behaviour is acceptable in a relationship and it also tells boys that they can expect to dictate who their girlfriends talk to.