My boyfriend has been acting different lately. Overyzing?

Yeah...you are WAY over yzing this. He seems like a good guy especially since he showed you the texts between both him and his ex. He's with you know so you aren't completely hopeless. As far as his not saying goodnight dear and all that, it could just because the relationship is growing and he feels that you know that he loves/likes you. He's just getting comfortable with you, it could also be caused because you're growing distant from him. Try initiating thing, call him babe and honey and all that, give him lots of love and see how he responds to that. He's already introduced you his family and extended family so that means that you are at least something that's a little special in his life and that you are important. Don't sabotage this, it sounds like the real deal even if you don't think you're good enough for him or whatever.