Definitely sending mixed signals not mentioning her boyfriend and saying she has to do things alone, but not sure how that qualifies as "using". Hiking isn't really something people "use" others for, it's not like he would have been carring her the whole time. If she was getting him to do her job when he was talking to her then yeah, but this doesn't mention anything like that. She could very well have just wanted a friend to talk to at work and didn't know how to bring it up after a while...

Maybe I'm overthinking this...