heartbroken 😭 *edited*

A few months ago a girl gets hired at my fiancé's job. He says he doesn't really know her or anything. She texts him in Spanish something along the lines of "I really love what we have but don't want it to ruin our relationships". She has a child a year older than mine and is with the father. Anyway he calls her and she says the message was for her "sister". I let it go, a few weeks later she texts him again in Spanish saying "don't want anyone to think anything bad". He claims it was about a song. Fine. His birthday rolls along and she buys him 2 polo shirts from Macy's. I'm like what coworker that you aren't friends with buys a guy clothes! He says I'm crazy. She writes in his birthday card about how he gives her the best smiles of her life and signs it  TE QUIERO MUCHO. I don't find the card until months later. 

I take my fiance and our son on vacation to my hometown. While we are there she's texting him to "check up in him" those are her words. Well at this point I see red and I tell him this has to end now! He tells her not to text him anymore outside of work.  She goes ballistic calling me "stuck up and arrogant" etc. he says nothing back. But when he goes back to work he comes home and tells me they "made up" when I get upset he told me I am "crazy and a woman hater".

Okay now to the present. He had a company party to go to. He gets dressed up and everything. I told him to take our car. He says no he will be going with her so he doesn't have to buy gas. HE ENDS UP PUTTING GAS IN HER SUV, instead of our Honda! I tried not to freak out because he picked up other people from work. I told him I would like him to keep his distance. That she has been disrespectful and I was uncomfortable. He sends me a few photos over the night. Just the guys. The next day I am looking for photos of our child on his phone. He has literally 20 photos of him and the girl alone close and she's always right on top of him in group photos. To the point they look like a couple. 

Am I wrong for being upset? We live where my fiancé and she work. She lives in the complex as well. She knows about me and the baby. Idk. I broke up with him but I love him so much.

A lot of you are stuck on not having friends of the opposite gender. That was a rule he made. I didn't care because I don't keep male friends. It's not about them being friends. It's about me feeling like there's some thing more happening. Like he's cheating.