How do you know if she's more than he says she is?

I really appreciate the opportunity to pour out something that's been an elephant in the room for my husband and I, and could desperately use any opinions on the situation. My husband works with a woman who has constantly been a thorn in my side. First let me state that at functions I have always been nice to her, but she treats me with an indignant response, almost like shes better than me which I find alarming. I mean what reason does she have to not like me when I hardly see her, and everytime I do I'm my happy go lucky self. Then I suspected that she may have a crush on my husband. She is always trying to go to lunch with him, they travel together in large groups, and even though he swears he tries to avoid her there are these text that pop up here or there etc. Im not one quick to assume which is a problem but two things happened recently that had my blood boiling. First when he was out of town and we were skyping she called his room and I could see him become instantly distressed when he took the call. It was such a guilty look, his breathing changed and he could hardly speak correctly. He told me it was because he was so scared I would be upset and he couldnt help it that she called, she was calling to just let him know everyone was going to dinner. Okay so I shrug it off. The next thing was this weekend. We were at a function, my phone died and we needed to meet back up with our daughter so I asked to use his phone. When I went to go through and send her a text to let her know where we were standing he took the phone back real quick, then wanted to be the one to call her. He kept that phone by him all weekend which was odd because he normally puts it with his stuff by the door. I decided when he got in the shower to see what the heck the deal was and sure enough there was a text from her. It said - I hate you for making me go to this. You owe me lunch. Possibly a foot rub. HATE. My question to you guys and gals, what do you make of this? I need someone to hit me with the truth here because Im afraid its more than hes leading onto. I let him know that I checked his phone, asked him what the Heck that was all about and he had a story about how he was scared to tell me she texted him that, and that he swears theres no feelings for her at all. Please guys am I a fool?

Have you tried confronting her and telling her to back off of your husband? It seems that there may be mutual flirting going on, but I don't know for sure. Be straight up with her and even act like a b*i*t*c*h if you have to. She needs to leave him alone and respect that you are his wife. I hope this will help.