Again you are overwhelmed with how little he respects you. Why can't he be like the person he was when we first met? Are you finding yourself asking this question over and over again? Why did he have to change?
The harsh reality
He really hasn't changed at all. Yikes, I know you didn't want to hear that. What has really happened is he has you and no longer has to impress you. Sad but true. He no longer has to woo you and with all the trappings that guys perform to get a maiden to look their way.
Many guys are not very good at the game of attraction, it is a performance and if it works correctly they have a lady. So when they have performed well enough to be successful, they think that is all they need to do.
Nudge a little
So what can you do to make him more the way he was when he swept you of your feet? How can you make him more caring and romantic? Well there are a lot of things you can do but be aware of the fact that this guy lacks imagination and spontaneity. They just need some extra guidance and it can take away from the fun of them just being brilliant enough to get it on their own.
The plan
First you have got to be patient as you are trying to lay the ground work for the outcome you want. If you are dealing with him being disrespectful to you in front of others, you have to confront him about it. You have to tell him that is not the way you wanted to be treated and how it makes you feel. Try to pick a time when things are calm and you are not angry. You must have respect for yourself before you can expect others to treat you with respect.
Tell him how he impressed you when you first met and how you loved the way he treated you. In order for someone to change they need to be reminded how special they are and valued. Not being critical of him will help in getting your point across.
You cannot tell him he needs to be more like this person or that person that will only anger him. It is under the same principle why parents should never ever compare one child to another. It is unfair and he may feel like you would rather be with whom he is being compared to and that will probably cause him to resent you. There really is hope, most relationships can be repaired.