How to stop feeling so insecure?

I have an amazing boyfriend! He never gives me reason not to trust him… We see eachother every couple days, he takes me out every weekend and he's just so loving, affectionate, respectful and fun but i just can't help feeling so insecure sometimes and I really want to stop because i don't want to ruin our relationship

so we were out last weekend and while he was driving he told me to text his sister for him. So when i went to his texts i saw two texts from his co-workers. I didn't open the texts but the last texts from one said "Hi. " and the other said "i think you should go haha"

i know he's not cheating or anything but if the 3 of them spend 8 hours a day together and he doesn't see them outside of work why does he need to text them? The 3 of them work in the same office with another middle aged lady for 5 days a week.

Also, he is such a friendly/nice guy and the stuff he shares with me he shares wtih them too and that bothers me too. Like the iphone games we used to play together he now plays wtih them too, or the jokes he tells me he tells them too. I know it's not a big deal but i feel so jealous:/
He doesn't hide anything from me though… He sometimes even tells me "go on my phone and see what jennifer texted me today it was so funny" and stuff like that but that bothers me more…

my dad has always been the jealous/possessive type and has made my mom's life hell so i don't want to do the same to him, so i don't want to TALK to him about it, i just want to change it in myself…

i'm not trying to say he's cheating or anything but i guess the fact that he has the same friendliness toward them that he has with me is what bothers me…

It's fine. Guys and girls can be friends too. It's not bad if it bothers you, my crush is like this. It bothers me, but it's not a big deal. If it keeps bothering you, you can talk to him. It's not being jealous if you're just asking about them. Maybe even talk to his friends and see what's up.

There are books on the subject that might offer insight but most of all you just have to STOP IT.
Stop being insecure. You say you have no reason to be. You go all Dr. Drew on it and say "my dad… ' Doesn't sound like you classified him as your dad so stop it.
So many people act like they have no control of their emotions. But as humans we do, well some do, I've seen it. Maybe some are just more evolved.

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