My boyfriend is a photographer and I get jealous. How can I deal with it?

before I have started to date with a photographer (who happens to be my boyfriend now) first thing that I considered was if I can handle the thought that he sees different beautiful ladies and take photos of them. At first I thought I can, especially when he said to me that I'm the one he loves and they are just models, but then now, I'm starting to overthink, I really get jealous, I know I'm overreacting but I just can't help it. He even asked me several times to come with him during their shoots, and I constantly refuse cause I know being there, seeing him taking photos of those gorgeous ladies would just make me feel sick but being not there makes me worried that he may flirt with his models or the other way around. I even get paranoid when I found out that he had a shoot with her ex-gf without even informing me. well, he used to inform me about his photo shoots, but that time, he didn't and it was only last month that I found out that she was his ex. I'm even having a low self-esteem, since he never asked me to be his model, given the fact that there are some photographers who had asked me before. The thought that he prefers to take photos of other girls than me makes me upset, I feel like he thinks I'm ugly. :( Please, can someone give me an advice about this? By the way, I never told him about this because I'm afraid he'll get irritated with me.