cheater randomly contacted me

during the summer I banged a" friend"(we never hanged out before just always talking to each other) then two months later I figured out that he has a girlfriend and I was the second girl that he's cheated with not the first but the second and now it's September and I called him out that he has a girlfriend and how it was disrespectful to do that and then he stopped talking to me for a while because of that because he got caught and now it's September and last night he called me and is trying to apologize like he apologized so many times but I don't understand why he's doing it now instead of when I called him out on it and it was just really weird and I'm really confused and then he left me a voicemail that I accidentally deleted but near the end I remember he said 'I was about to say the three magic words' and saying how he's 'falling for me' and… And honestly I don't know what to think because is it true or is he just playing is he just trying to get in my pants again I don't know what to do and please give me advice and he said they broke up but idk it's hard to believe