just not ready

my best friend keeps asking why i always hook up with this guy i dated a couple years ago. This guy i was seeing we were not an official couple but we were seing eachother for a year and he left me for another girl after i lost my virginity to him well half a year later the girl he left me for cheated on him with his friend so he called me up and said he was sorry that he now knows what he did was wrong well i forgave him and we became kinda friends well after all that we both started seeing other people and the guy i was dating we were about to move in together and then i found out he was cheating on me and got another girl pregnant so we broke up and it hit me hard cuz i really fell for the guy after i wasnt ready to get back into the dating world well my friend broke up with his gf cuz she was cheating too so we decided to hook up no strings attached i guess the reason is cuz im not ready for a serious relationship and i i know hes a safe option i wont havre feelings for him again and he knows this i guess i hate that my friend is judging me even though she use to use guys all the time where im hooking up with this one guy and he know everything everything is out on the table and we are both single so no one is getting hurt