My boyfriend high five a random girl while we were out. I have trust issues and expressed my feelings to him. Why would he do that?

Me and my boyfriend have been arguing for a while because of the white lies he told me about women in the past and recently. I now find it hard to trust him around women. I told him how I feel about the whole situation and I may want to end this relationship because of the lies. He told me he will work on himself and get my trust back by proving himself to me. We recently went out to a club with friends and he literally spoke and high five a random girl turning his back to me - it was roughly 10 mins after we walked through the door. I was very upset and he told me not to worry it meant nothing! But why would a man do it for no reason? I don’t understand the motive behind this gesture and a quick conversation? Can someone help and explain this to me please?

My boyfriend high five a random girl while we were out. I have trust issues and expressed my feelings to him. Why would he do that?
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