34F in a long-term relationship with my best guy friend, who is 29M, for 11 years.

I have a friend whom I've known for years; we met in 2015 at work. That's also where I met my ex. Throughout my relationship, my best friend was always my rock, offering support and a shoulder to cry on. When I finally broke up with my ex, things took an unexpected turn. My best friend started flirting with me, and I went along with it until he suggested we get a hotel room. That caught me off guard, and I ended up ghosting him, feeling like he was treating me as if I were just another girl. Fast forward to 2024, and we've reconnected. We text every day, he sends me good morning messages, and tells me I'm beautiful. We spend hours watching movies on FaceTime, and he's persistent in reaching out if I don’t reply. I've started developing feelings for him. However, there's a complication: he’s active on Hinge and has been dating a girl. He talks to me about their dates, and I give him advice as his friend, but he keeps mentioning that this summer I can come to his place for the weekend because he has a pool, and he often offers to do things for me. I asked him how he thinks our friendship will work if he ends up in a serious relationship, and he confidently told me that I'm not going anywhere in his life, even if he falls in love. I replied, "I guess we'll see," but it's becoming increasingly difficult for me to handle his connection with this girl. Hearing the details he shares is really hard, yet I haven't found the courage to tell him how I feel. Just last night, we were finishing a movie on FaceTime after he returned from a date. The moment I picked up, his first words were, "Wow, you look so pretty." I thanked him, and then he asked, "How are you not married yet?" That really caught me off guard and left me feeling quite shaken.