How to overcome insecurities?

My boyfriend has a beautiful colleague who is very close to him. They go to the pub together and shop together. My boyfriend doesn't have those intentions but I still feel.. he may find her more beautiful than me. He is spending more time with her than me. (we are in LDR by the way). What do I do? They click pics soo close that her boobs are touching him. I told him that it's hurting me but You don't need to change anything. My boyfriend didn't change anything even though I told him that it was hurting me. I asked him not to send those pictures at least, but he says he doesn't like hiding and continues sending them again.

What do I do? How should I overcome these securities?

How to overcome insecurities?
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