Because i am jealous he thinks i don't trust him

So do you experience that if you get jealous at some girls because they are spending time with your boyfriend?Yeah,it would be cool if they were friends.Yeah,they maybe are friends.But i hate the fact when i hear that this girl like my boyfriend and think he is hot or attractive.Once i heard of one of my friends that one girl thinks that if she gets a good relationship with him she will get him ajd he wouldn't be mine anymore.Fuck these girls,they don't think about how I feel .I am so jealous when i hear with who he is spending time.Yeah ,he says that they don't have chance to get him because he loves me.SO sometimes we start arguing because he thinks i don't trust him enough.But the problem is by me.I am not so confident and i can't just believe I deserve such an great guy as him.I just don't think that i am the best that could happen to him and that's why i get so jealous.I get scared i could lose him to an better girl because i feel like anyone is better.Anyone of you can feel me?Do you relate to this feeling?