Would I (25f) BTAH if I tell my friend (25f) that I like her?

Hi guys, so first time making a post here but I really need some advice. For some context, I met a girl that started working with me around a month ago. She became friends with one of my closest friends so we obviously started seeing each other a lot more. I honestly thought she was beautiful the first time I saw her but didn't think much about it. We started meeting and talking more with our friend, and then alone with each other, so I started thinking about her as more than a friend. The thing is that she likes another girl and is in some type of LDR with her, but they're having some problems right now and I don't know if they'll break up or not. When I started to realize that she didn't feel the same for me I tried to stay away but it was kinda hard with us working together and sharing the same friends. We also click so well, we share inside jokes and can literally talk about anything. It's honestly the strongest connection I've had with someone in a very long time so it's difficult for me to stay away. I know that she's not in the right headspace to tell her that I like her but I also can't stay in this limbo without her knowing about my feelings. I genuinely enjoy the time we spend together and it feels like I've found someone that I share a true connection with, but I don't want her to think that the time I've spent with her was only because I like her. So I guess what I'm asking is if I would be TAH if she knows about my feelings and risk our friendship?