plenty of fish message limit?

[Sergio]

Is plenty of fish Cblocking me? I hit it off real good messaging girls making them laugh the first messages and then after the third one I send they never reply back! OK so I thought I was boring or they weren't interested but it keeps happening to me with all the cool girls I talk to! Is there a limit of messages you can send to one person?! Are they deleting my last one from being sent because I am not a boring tape recorder when I message, I keep the flow going. If there is then I might as well ask for their number the first message which will be a turnoff and that I want to get in their pants. Any explanations?