Why is he doing this?

my ex and i broke up about 11 months ago, ending an incredibly deep and complicated relationship. the break up left both of us feeling us incredibly sad, both crying every day afterwards. However, about 3 months afterwards, my ex began to become interested in another girl and they later began dating, which I think was a rebound relationship because it feels like he’s been rubbing it in my face. they’ve been in a 4 month relationship so far and I heard that they were recently having some problems and he suddenly texted me an apology for being toxic and manipulative. what is all of this supposed to mean? why is this happening? does he still have feelings for me?
Why is he doing this?
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