My daughters first boyfriend in I do exist

My daughter is 14 years old and has her first boyfriend since 6th December (my 40th birthday). I have to say the boy is great! He is so polite and very much “in love” with her. He looks at her with loving eyes and treats her well.....but that’s where psychotic mummy is coming in :( I am so angry with myself. You ask why? Is it normal to worry about him falling out of love with her? Her heart being broken? I am stalking him on Insta. I am very ashamed of myself. Stalking him to see what he posts under other girls pictures :( It is consuming me....my every day life....all this worry. I am so angry! So worried about her. There is this girl who would like them to split up. She is interested in him. She writes through Whatsapp with him and posts nice looking pictures of herself and he reacts and posts nice comments under them. My daughter is oblivious. I am so worried about her. How can I make this stop? How I can just let things roll? How can I let go? How can I just let them be? He is great don’t get me wrong but I don’t like the comments he posts and how he is with other girls in public (hugs, play fights....) Any ideas? Any comments? Any help from you guys?