So, there's a co-worker at my workplace (I work in a gym) whom I get on well with. With the way she behaves I'm fairly certain she isn't straight. She passes remarks on her Instagram page about how 'fit' Miley Cyrus is with a very gay connotation. She comments about how another co-workers girlfriend is 'quite cute' and has said so more than once to me. I also want to point out that she has a boyfriend. At one point I passed a comment about a couple of guys staring at her squatting at the gym (she works her butt a lot). We went back and forth a small amount about her squatting technique and I said it was pretty ok. She then replied making a jokey remark about me being almost as bad as the guys, but with a winking emote. I just went along with the joke at the time, not thinking anything and said, 'Hell yeah, gotta check out that booty!'. She replied, 'You can check out my booty any day xo'. I sat there for a moment very... I don't know... stunned? I honestly didn't know what to say back. Thankfully it was all over WhatsApp or she'd probably have had me for breakfast at that point. Ever since that day, she's made even more jokes with flirtatious tones and behaviours to them. I once casually passed a comment about my body shape not being quite where I want it to be, and she'd say how I have a flat stomach, looked me up and down, then smiled and winked. Me being me I just brushed it off and carried on about my day. Last week there was a girl doing hip thrusts for 155kg so I messaged my co-worker with a joke saying she's no longer the 'booty queen' because someone is lifting more than her. She asked if their form was good. I responded saying I had no idea because I didn't want to stand there gawping at some woman thrusting into the air. She passed a joke saying she 'thought it was my thing' with a winky face again. Yesterday I pointed out the gym was quite quiet and that she's missing out. She said she'd be in shortly (she was due to start her shift in less than an hour). I joked a bit more with her saying 'shortly aka 4 PM' (it was 3:20 PM at the time. She replied commenting it's only 40 minutes away, so I just sent an emote that had no mouth. Her response was, 'I know you're dying to see me but calm down xxxx'. Again I just went along with it and made a joke saying I was getting withdrawal symptoms. Today was the biggest confusion of all. The Welsh government have chosen to lock down Wales after the 28th December, so all gyms must close. While in the staffroom with her she remarks, 'Not to rub it in, but the gyms in Liverpool are staying open'. I just looked at her with a deadpan face and said, 'Thanks <name>'. She then said I should come to the gym in Liverpool (where she lives) and train with her there. I looked at her and said confusingly, 'Why would I travel all the way to Liverpool just to go to the gym...?' Another co-worker came in just as she responded, 'We can go for coffee after...' the co-worker grinned and said, 'Coffee..? Who knows what that'll turn into next!'. He swiftly exited the staff room again and left us to it. Then she continued asking me if I liked breakfast or having having breakfast out. I said it depends on what kind of breakfast because too much in the morning and I feel ill. She then switched it to be 'a kind of breakfast/brunch sort of thing'. I asked her where her boyfriend is, mostly because I was confused as to why she wouldn't be spending it with him. She said he lives elsewhere and she'll be alone during the lockdown. The whole scenario was confusing to me. I wouldn't have thought much on it but there are so many little instances where she'd make flirty jokes with me. I asked a friend and they said that she may just be being flirty as a friend, but then if it goes beyond words, then maybe it's something else. I don't know. I'm probably overthinking the whole thing but it's giving me very mixed signals.