early bird catches the worm
I was never good at dealing with your flirting moves to girls, and guess I will never understand how a person could change so fast when he told you he loved you and always will, but was already asking someone else out after. Sorry for holding you back, you can ask whoever you want now.
You were always hiding something from me in our relationship even if you said there were nothing. But every time I ended up hurting more, so how could you call this love when you made someone cry so much? Maybe I'm just good enough for you. So thank you for everything for all these times, and wish you only remembered the good things if there was any. You will never hear from me again.
Please send me back the book. You don't deserrve (having) our memories when you've been always looking for other possibilities.