Am I tripping

My boyfriend before he asked me to be his girlfriend only a couple days ago would actually want to text me and get to know me and talk to me.

Now that we’ve been in a relationship for a week he hardly seems interested unless it’s in person. He rarely texts me and if he does it’s short unless it’s sexual. Before we started dating he put thought into texts and actually tried to keep a convo going. Now I find myself texting him back sort of fast while he takes awhile sometimes.. and me trying to keep the convo going.

Is this normal? I’m getting a feeling it isn’t mutual but then in person he is super into me..

Couple mins ago I texted him saying how I’ve been sleeping better since I’ve been in his bed and it was a short paragraph..... he didn’t reply but read it then I said “or not” and he replied only with “just got home forgot to reply sorry” okay.......