why now ???

Please tell me what more i can do...last week flowers sent to my office, i refused telling delivery guy, person does not eork here,,, card left on car window, i threw out, unopened as i drove away....
sunday nite, after midnight, he stops and blasts his horn,,, i am sleeping, refuse to look out window,,, he drives away....but tonite,,, i leave work late, n stop at grocery store...in check out line, half way through order,,,n i get tap on shoulder,,, OW..
my face just went shock for a split second...
i say nothing n turn back to pay...
but she starts in with he is her man,, he will not let her go,,, n i should be put in my place once n for all...i looked at clerk...said i am so sorry, and i walked away....she started to follow me,,, i turned snd said....look its been a year since i caught u in my bed,,, i have not been around either of u...so what is your problem...leave me alone...n i turned away, n drove home... i just dont know what more to do...
please, any suggestions