Self sabbotaging behaviour. Good at all!

I have been having problems with my behaviour and how it is affecting people who are close to me my girlfriend and my family... i am constantly expecting things from my girlfriend and i am really needy and want to be loved and taken care off and i want reassurance and im really scared that people i love will leave me and i really want them to stay but when i dont get the love and reassurance all the time ( for obvious reasons as everyone is busy and have 100 different things on their mind) i react in a very toxic way and cry a lot and tell them that they dont show me love and that they dont do this and that and then i feel guilty for doing all of this and i feel like im the worst person alive this is really affecting my relationship with everyone and my relationship with myself is not good at all