Should I fight for my man or just walk away?

Should I fight for my man or just walk away?

From a female blog reader:

Straight to the point, i m 28 years n i have been dating dis guy for 7 years and he promised me dat i was goin to be d mother of his children the problem is dat last year he started acting up he onli picks my call wen he’s at work but once he gets home he doesn’t call me n he doesnt pick up.
I called one day and a lady picked up i got angry dat he was cheating on me he tried apologising but i dint want to talk to him den he stopped n i called him but he doesnt pick he also told me it was over but i begged him cus i dint do anything he told me he has moved on n i shuld stop calling him i went to see him n saw female tins in his place n he told me we were done. Pls house shuld i still fight for my man or i shuld let go he sends me congratulatory msgs but notin attached…i also called d girl n asked her to leave my man but she just laughed