I really need some opinions and advice cause I'm going crazy here! Bear with me cause English isn't my first language. Some background information and some context. My bestfriend (26F) and I (26F) have been friends for almost 9-10 years. She is the only of my friends that I am this close to. I'm bi and she is straight. At least she says she is cause here is where things get confusing? First of all, she doesn't seem to care much about having a relationship. So far she only had one short relationship AND lately she's been telling me stuff like: "You're lucky that you like both genders." "So how does this work during sex with a woman?" "There was this really hot woman at work. I'm straight but I have eyes." "There is no way I'll find a man with my standards but we'll definitely end up living together with our cats." During our last phonecall she asked me to share details about a relationship I had with a woman while saying that I hadn't informed her about this and that she is curious/has questions. Secondly, I got her an expensive gift she really wanted for her birthday and since then she sends me messages like: "Using your gift is the best part of my day." Thirdly, I remember discussing with her how I like my partner being able to pick me up like I weight nothing and the next time we met she picked me up and spun me around. Lastly, she is overly affectionate and calls me nicknames?? One time that we went out for dinner, the waiter forgot to bring me a fork and my food was a little delayed. So my bf fed me herself some of her food. Or for example, she will sometimes text me: "Good morning my (my name)." or "Goodnight love." I don't know, perhaps this is a thing that's usual for female friendships (perhaps all these are) and I'm overthinking it but I'm not used to it and it's hella confusing. Please note that all of this is kinda recent behaviour. Your opinions and advice would be greatly appreciated! I really care for her but these mixed signals are confusing me and I don't want to assume the wrong thing and fuck things up...

TLDR: My (26F) straight bf's (26F) behaviour changed and I'm not sure if she is hitting on me or being affectionate. She started doing things that she didn't before and all of these mixed signals are confusing me. I care about her and I'm not sure if I'm understanding correctly or if I'm overreacting and overthinking or just getting it completely wrong. Your advice on how to navigate this would be appreciated!