Expressing making a Promise and swear

Andre : Hi, Jen. I was told that I'd fine you here. I want to talk with you.

Jeni : I'm sorry Ndre, I can't, Im verry busy and I have many activity today, I dont have a

           time to talk about anyway.

Andre : But I want to apologiezwith you, please forgive me, I know you think I'm a looser

              man, but I promise to change my attitude.

Jeni : You said it too yesterday.

Andre : Please Jeni, I swear this time, belive with me!

Jeni : Sorry I have many activity today, I have to go, bye!