Is it OK for my boyfriend to give his number to random girls?

SoulGirl
I've been with him for 9 months. He told me he wanted us to be serious.

Throughout the relationship I noticed he's been liking girls photos and commenting on them. So when I started doing it too he got upset at me...I told him I caught him doing it a lot and he did stop after a while.

However a few months later, I have noticed he talks to A LOT of girls who I never even have heard about. He is very protective of me, so when he asked me who are all the guys I talked to, I refused to tell him until he told me everyone he talks to. He has a lot of girls on his phone. Then he started going though my phone constantly asking who I talked to and not to text anybody. One day I decided to check his phone, and he said "I love you" to another girl, and was flirting with a girl he told me he doesn't like. After that, I saw his inbox that he sent a message to his friend from out of town asking if there are any girls they could chill with while he was visiting.

I almost left him... He cried for two weeks promising to never hide anything from me and do nothing like that ever again... and keeping our phones private.

So I have him another chance (about 2 months ago)

However, I noticed that he gives out his phone number to a lot of girls. For example, one girls posted on facebook that she got a new phone, and EXACTLY a minute later, he responded with his number. I have no idea who she is but he only has 1 mutual friend with her.

Is my boyfriend up to something...? Should I be worried?
Is it OK for my boyfriend to give his number to random girls?
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