LDR on the rocks?

I am a 42 y/o male dating a 40 y/o female. I live in Cam Nj. She lives in St Mo she has 3 kids I have none we've been dating for around 2 years we have yet to meet. We've been talking but, lately it seems things are going sour. Although she does talk she says she is bad at expressing emotions. She's very family oriented but its coming off a bit more excessive lately than not then not. I've expressed to her that at times (most of the time) she doesn't seem to be into it or seem to really care about the relationship, and she brushed it off. She told me to get out my head. The first time I mentioned it I asked her if she really wanted to do it any more(be in the realtiondhip) and if she wanted to go back to being friends and she got mad at me. I mentioned this multiple times with each time getting a worser reaction. She also likes females. She hangs with a few girls she says are family friends. I know (or at least I assume) one spent the night over her house at least one night. Which she doesn't know I know.I could be reaching though (Not really sure she did). Lately I haven't been calling her as much as I was although I do still call her. But when I do it comes off as I'm bothering her I mentioned this to her as well. Which caused a even bigger riff between us. I've spoken to my supervisor at work about it and she said from all the stuff I told her, it seems that my gf is using me. And she's Def cheating. I'm at a loss for words there's more to it but I want to know what others think before I act on it.