Trust

How can I build more trust in a relationship? I get really jealous and nervous when my bf is around other women without me. Mostly because he is very friendly (kinda a natural flirt) without meaning to be and some women take it the wrong way. I trust he wouldn’t do anything but I get scared that he is flirting a lot. I talked to him about it and he said he never notices when he does but I should trust that he wouldn’t let it get anywhere else.

Am I being crazy and not being trusting or what because I am very confused and I don’t want to lose him.

he is every bit of perfection and makes me so happy.