I am telling you 8.... The men who have SUCCESS with women are the men who let the woman go when she acts like she wants out.
They just let it go and leave her alone. She wants out.. Fine. I hear you. I accept it. These men then find out that SHE starts pursuing him after a time of letting go..... YEP... They most certainly do.... They then sometimes reject HER when she comes back (as you friend did when his WS ASKED to come back and he decided he didn't want her)
When she contacts you. Be nice, but make the call short and to the point and politely get off the phone. Women are attracted to busy men. Women are attracted to men who are emotionally strong.. I realize that my 20 plus years of doing this means nothing, but would seriously encourage you to listen to me. You are sounding weak and needy by sending flowers and now looking for an excuse to call. Her not contacting you is your answer for now. Why can't you accept that? Do you need to have her tell you again?
It is ok and good for you to accept what it is. Accept it. Your best chance to get her back is to let her go. It really is.