Why do my exs want me AFTER im taken?

[puppylover]

I assume they stalked my facebook profile to check my relationship status and apparently they still have my number. Now they're all contacting me recently. My 3rd called 2 weeks ago. My 1st texted me last month and last night. My 2nd called and texted me last week. I told them to leave me alone. One did. The other 2 did not. Why are they suddenly going after me once I get a new boyfriend? If they wanted me they shouldnt have dumped me (yes all 3 of them dumped me. One cheated). Only one had sex with me by the way so it cant be that they all 'miss the sex'. Why are these guys bugging me???
Ps- my phone provider said it costs money for me to block numbers :/
My provider is AT&T and i dont have an iphone. Its some kind of android

[Michael]

People want what they can't have. Whats with your phone provider?? I think you can block numbers on an iPhone for free.

[Meagen]

I've actually heard there's a pheromone we release when we're happy and getting some, and probably because now they are thinking of you again. Also, there is apps you can download to block numbers and most phones have an option in settings, try looking again. Your phone company just wants more of your money.

[Jenny]

WOW... you must be incredible... They must be really going out with losers... Have decided that you are not so bad.... Finally... change your phone provider... there should be NO charge for blocking numbers......