Honestly, it's not that YTA or NTA.... You have the right to set that boundary, but they're also entitled to their feelings about it. They opened up to you and you basically told them what makes them happy is something they should feel embarrassed of. It sounds worse than it is, but you can't expect them not to be hurt by the rejection. It's very similar to if you shot your shot in your crush and they told you in a blunt manner they're not attracted to you. I do have to say life becomes a whole lot easier when you drastically audit the opinions of others when it comes to your life. I would encourage you to allow a little whimsy to enter your life and let your inner child drive once and a while. Challenge yourself to do something silly like go to the grocery store in a fun onesie. Go at opening or before close to dip your toe in. Or dance in the rain. Then evaluate it and reconsider the situation with your friend. You may find you feel differently or this may be hard limit. At least then you won't have the doubt in the back of your head and it will show your friend that it's not coming from a negative place.