Is it normal for the spark to go away in a relationship?

i been together with my boyfriend for 2 years now... since the beginning of our relationship, we would buy each other things and get romantic with each other and not cuss lol but now that we're both comfortable and be together for longer.. he doesn't care anymore.. Like the romance isn't their... we don't know what to talk about.. We're always cussing at each other (not fighting ) just talking cussing.. We don't buy each other anything ... Why is it like this???? I try to be caring and romantic and actually want to Say cute things to each other but he doesn't care.. 😒