Looks pretty good, some small errors but those were fixable with Grammarly. There's also some sentences you can combine into compound sentences to save some space, but I didn't do that in case you just wanted to leave it
A paragraph for him <3
Thank you for always being there for me. You always carry me through the tough times. You are the definition of amazing. You always know how to make me smile and laugh. You light up even my darkest days. You are so perfect. You're willing to spend money on me and do whatever it takes just to make me happy. You always love me no matter how stupid I look. Even when I upset you or make you sad you always find a way to forgive me. You love every part of me. Even the weird part of me. You know I put ketchup in my mac & cheese. That just proves you love me because that's weird as heck. But you do weird stuff too. And you're silly. And I love your smile. You're so perfect. I could look as hard as I wanted and I couldn't find a single flaw in your beautiful, perfect, amazing you. Don't let anyone stop you from shining your sparkle. Anyone who dims your light needs your light to bring them out of the darkness. You bring so much happiness to everyone around you. Everyone loves your energy and the good vibes you give off. Keep being so amazing and thank you for every moment we have had. I will treasure them all for the rest of my life. You have shown me what true love and happiness are. My favorite memory of us so far is when you pushed me on the swing. It made me so happy. And it's those simple things you do that make me so freaking happy. When you were pushing me my heart was so happy and I was smiling as big as I've ever smiled. You have no idea how much you mean to me and I'm so grateful I have you in my life. You always chase away my darkness and you have given me a purpose to live in this big and scary world. I can’t wait to walk down the aisle and finally be called your wife. I want to have a family with you because I know we’re going to be forever. I want to be with you even when we’re ghosts because I love you. And I will never stop loving you. Thank you for every memory I have of you.
Love, Your girlfriend <3