He told me he shouldn't have left me

So Wednesday night, my ex said he missed me and needed me (again), and he told me that he needed me back in his arms, and that he needed his love back, and his girl back. He picked me up the next morning and when I got in his car, he pulled me in close and hugged me and kissed my forehead. When we got to the neighborhood sign, he told that he loved me. When we were on the way to his house, he apologized for all the things he did and said he shouldn’t have left me. We went in his room and cuddled like we always did, and he just kept saying that he was happy to have me back. He said he was happy he still had my heart, but I said he didn’t have it all (cause he shattered it several times…) but he sounded determined to get it back. He told me he was depressed the whole we were apart, and that he tried to find someone else, but he just wanted me.He said that he always loved me. He kept calling me his “wonderful baby girl” and he kept snuggling up close to me and had his arms wrapped around me. He kept telling me he loved me several times, and that he’d make it up to me from all the things he did.

yesterday confused me, we barely talked and it kinda made me sad. He was so lovey and stuff for 2 days. He just seemed so uninterested for some reason, I feel like I did something, the only sweet thing he said was “goodnight babe” I went to bed early cause I was irritated all day…Why would he do this? I know he wants me, I ‘m just so confused, what happened? 🙁