She thinks I'm flirting with other girls, how do I tell her I'm not?

[CM]

This girl I've been semi-dating has been giving me the silent treatment because she thinks I'm flirting with another girl on FB in the comments on a status I posted, and won't answer my calls and texts, so idk how to talk to her.

Her: I wuv this and you! Miss you
Me: Love and miss you too! You're the best! lmk if you eventually manage to save every german shepherd on the planet, I'll throw you a party!
Her: omgoodness you just made my day! I'm gonna I swear! <3
Me: An adjective does not exist to express how awesome you are
Her: You're too sweet <3

The thing is, I'm friends with her boyfriend, I have a picture of the three of us together on my phone, he sees everything we write on FB and trusts me, because I'm like this with everyone, and that's just how the two of us talk, because we're both the type of people who like to make ppl happy, and random compliments, but this girl I've been talking to doesn't know this, and idk what to do.
Babette - the girl I'm seeing doesn't have a boyfriend, the girl she thinks I'm flirting with on FB has a boyfriend, but I'm friends with both of them, he sees everything we write, and knows that's how I am with everyone, but she thinks I'm flirting with other women.

[3 or MORE]

just tell her.

[Timothy Stephens]

Stop all this immature nonsense.Let her think what she likes.Keep away from her and keep better company.Never get involved with insecure girls.

[Babette]

Let me see whether I get this right... you are "semi-dating" (?!?!) a girl who has a boyfriend, and she is angry at you because you talk to another girl on FB??? Did I get this right? If I did, this is a REALLY screwed up relationship between you 4 people. First of, what business does she have cheating on her BF? And why are you cheating on him even though you say he "trusts" you? I think you need to get out of this really messy and unhealthy relationship before everybody gets hurt.

[Holly]

I can understand why she was upset because if she is insecure or likes you so much then any time you talk to another girl in a flirty way even if you don&#x27;t mean to she will get upset but try and tell her especially face to face so she&#x27;s cant ignore you and have definitely heard you.