does your fear of abandonment ever have a seemingly concrete reason why?

[22F] I don't have BPD but CPTSD diagnosed. I am currently living with boyfriend and I love him and his family is like so normal it's insane I really don't know what od do if I lost it. He respects when I say no but I have this people pleasing trait where I think if I do not please every time I might lose the people I love. I have been working on focusing on myself but it's scary knowing the possibility of losing living at hos house is having to go back to my old house. My father lives 5 minutes away and hes pissed at my mom, a drunkard and real mean and whenever I stay at my house alone I'm very afraid cant sleep etc.

Does anyone feel like your fear of being thrown away is rooted in a real issue? I don't know if I'm being irrational or not.