Boyfriend acting very jealous

My boyfriend has started to act very insecure and jealous of me and other guys. To a point where it's really starting to get me down. Like for example, my dads car broke down, and he wanted me to ask our neighbour for jump leads. And my boyfriend took the nick, he was like, your dad is a total dick asking you to go knock guys doors for jump leads, yea I'm here trying my best to get you some, just you go flirt with other guys. And don't speak to me again 😕..... then because his friend called to my house who he thinks I fancy, he wouldn't speak to me and kept firing me looks 😕😕😕.... then admitted he just gets very jealous of me. I haven't done a single thing wrong. This all started because a guy in the supermarket I was buying a sim card for my phone in, took down my new number. (Without my knowledge) and started ringing and texting me.