I think I’m pregnant and I don’t want to be....

I took a regular at home test, and the other line that would make it a plus sign was kind of there, kind of faint, but I never had that show up like that. So I thought ehhh, probably not, I’ll test again later. So I got one of those digital tests....and took it two days later...it says pregnant. And I thought it was what I wanted. I talked about it all the time with my bf. but truth is, I miss my ex who I was engaged to before this guy. I know, I’m a terrible person. But I don’t want this anymore. I feel so stuck. I don’t know what to do. Yes I showed the father this test. And I’m putting this out there knowing I’m probably going to get a lot of negative feedback.... but I didn’t really want to go to friends or family about it yet. And you guys were the first thing I could think of.