Is my boyfriends behaviour justified?

My boyfriend and me started an online LDR 3 months ago and things have been really great. We spoke about our expectations for the relationship, like marriage, living circumstances, finances, employment and our personal beliefs and values. Which we are on the same page with. All that is left is to meet up which will happen in November this year.

It hurts me sometimes he mentions these other girls he can be with and he still chooses me despite how silly an online relationship is. I can see he feels embarassed to be in one which is fine because I had stated I am not mentioning it to anyone until I meet him. But he keeps persistently mentioning he knows other girls who want to be with him and makes me feel not secure?

He also mentioned another girl we both know and he told me she knows we are dating. But when we are on the same call together she was overly friendly with him and I got very upset, and stated she didn't. I asked her and she confirmed no, his response was "I thought she suspected it but I guess I was wrong". Makes me not trust his words... it wasn't about him defining our relationship it was more he assumed she knew, and didn't.

I dont feel too secure with him. Do I have a right to be this way? How should I mention this to him?
Is my boyfriends behaviour justified?
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