Initially I was like sure, that’s fine. Then I got to the ‘hung out at her home’, ‘go shopping with her’ and ‘texts her everyday’ and I was like errrrrrr no. You are definitely not crazy for being uncomfortable about this.

You have three choices:-

1. confront him and make him make a choice (be aware he could well choose her)
2. you dump him and move on
3. you deal with it and stay with him

Personally, I’d say either 1 or 2, because there is no way I’d be accepting that.