Hello everyone, fellow borderliner here

so I'm writing this because I feel really bad. I have a friend who kept on bombarding me with messages throughout the past few weeks and demanded me to check this or that stuff, to reply immediately to his messages and to do stuff I didn't really feel comfortable doing. I followed most of his demands though because I have this people pleaser syndrome, I have a really hard time saying no to someone without feeling like a wreck full of guilt. It costs me lots of energy and whenever I tried to distance myself a bit to have a bit of a break my friend somehow sensed it and immediately accused me of it. So that basically kept me pretty much in line. I was finally able to tell him that it's getting too much for me and of course he tried to guilty trip me. Now I'm feeling super bad and also paranoid that he might try to pull something off which could hurt me in one way or another. I am pretty much afraid of even just checking my phone because I'm expecting some really nasty messages or accusations or that stuff...though rationally speaking I guess I am overreacting? Any advice on how to handle this?