Like seriously

It's sad when you get offered your dream job and you look over with a huge smile at your bf and the next words out of his mouth is "if you take it we're through" or I'll be mad . Tf ? And then to top my day off I went it to a store I liked and bought a top and some slides and walked out to show him cause he pitched a fit and didn't wanna come in and he saw I bought something and he said take it back or I won't talk to you .. and then keeps going on and on .. like wtf what am I doing wrong to make him mad ..?