FIRST IMAGE:
Sweetie Belle obtusely flirting with Spike, Spike being oblivious and not interested and Applebloom and Scootaloo being horrified.
Spike had just attempted one of his numerous tries at asking Rarity out and had tripped on his own tongue. He’s a lovesick fool. And Sweetie Belle wanted someone to see her the way he saw Rarity.
Sweetie Belle... just stop
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SECOND IMAGE:
Sweetie Belle learning that Spike did not feel the same way about her as she did for him and figuring out he was still in love with Rarity.
Harsh reality, SB.
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THIRD IMAGE:
After SB had been in her feels for a while, she decided she needed to get away. She wanted to get as far away as possible. That was Mount Airis, so with the excuse of visiting her friend Terramar, she leaves, and ends up spending the night with him. He falls for her and after the night they spend together, SB finds that she is pregnant. She keeps the foal and carries her to term, giving birth, then leaving the next day.
Terramar doesn’t go after her for fear that he was the one who forced her into having the foal in the first place
Suddenly alone and horrible miserable, Terramar gets a letter from somepony who had been in a very similar situation when they were younger
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Sweetie and Terramar were like 18/19 when they had their kid, little Snowflake. So it was basically a teen pregnancy and SB decided she didn’t want to raise a foal and knew that Terramar was a good guy, so she left. She was very shocked when he never contacted her, but was happy for it nonetheless.
Then he started showing up at the family dinners and she decided she would request a lot more concert/tour dates, to the joy of her agent.