Although your latest post does seem to put matter in a different light I"m afraid I tend to agree wiht Tranzcrybe.
Flirting is not ta particularly good idea when in a relationship and neither is (in effect) pointing out those who some may think more attractive to look at than you.
You did say he still occasionally indulges in this practice.
Now I'm not saying these practices are a deal-breaker, or anything so serious in themselves. In fact if you had a robust image of yourself you might be able to shrug them off without undue hurt.
However you are not in that position, and to get there may take both time, medical help, your BF's help and something from you too.
It's not hopeless, just can take time and be very wearing in the meantime.
Among other problems I have an anxiety condition, fortunately now a whole lot better for precisely the reasons I gave above, personal and medical help. Under my current circumstances have lot more confidence in my self, to give and receive support, to be capable of loving and give loved in return
I hope to hear more from you again