Should I break up?

Hello im F21 and my boyfriend is M21 and we've been dating for a year and a half.. Things were smooth one year in and actually it would surprise me how well he treated me and how much he loved me.
But after the one year was over he became distant, ruder, less lovey dovey and we kept having frequent fights.. i tried to explain to him that he's not the same and everything but he never understood. We recently talked about it again and this time rather than getting irriated or fighting he said " i know im loving you less etc and i want to make it work and change blah blah" but at this point I don't know if i believe him... We had that conversation like a day ago and he's the same old i know one day is not enough to analyse but I'm just fed up and hopeless... I don't know what to do i feel like we should just break up atp but i love him I don't know
Should I break up?
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