Actually it is not you. One month is early and a good start. But if you drank any amount regularly at all and you actively work on recovery as opposed to just sobriety you are going to go through a lot of changes. Very positive changes. But as others have said, emotions are rough early on. So is rerouting and rebuilding our lives into something different. Then throw in the brain fog of early sobriety and physical changes. You are not you yet.
Also, sometimes the other person is intimidated by your recovery. It means changes for them as well.
Put 100% of your effort into your recovery and give it time. Much will straighten itself out.