Most Helpful Girl
Men do this too! I have experienced this many times with guys.
People in general are flakey now a days. Things move fast. One minute they are interested in you, the next they have already met someone else. Plus a lot of people are still weary of online dating and stuff like that. So they may have a profile, but may never meet anyone from it.
Some women will use the excuse that they have a boyfriend, because some guys honestly won't leave them a lone if they say they are not interested. Some guys will continue to harass them non stop. I had a guy once who I told him I wasn't interested in him (because he was saying some pretty creepy things to me), and then he continued to message me for 2 YEARS!
I never answered any of the messages, but he would say things like "This is the anniversary of when we first spoke", "What would we be doing right now if we were together?". Stuff like that, really freaked me out!