Rainbow Dash x Zephyr Breeze
They began a relationship not long after Twilight became Queen Of Equestria,they started by dating in secret (cause Rainbow wanted to see if she could trust Zephyr) and after 3 years of dating in secret they told their friends and family that they are dating and not long after they got married. After 1 year Rainbow found out she was pregnant with a girl but when she told Zephyr he got scared that he won't be a good father and he left.After the divorce Rainbow was devastated and promised to herself that she won't ever get married again…

Rainbow Dash x Soarin'
But after she gave birth to Windy (with Fluttershy's help) she fell in love with Soarin' ,but this time she was more careful than last time cause she didn't want to have her heart broken the second,even if Soarin' tried everything to convince her to go on a date with him she still wasn't sure if she could trust him until Fluttershy( who at that moment was married and had a kid with Discord)opened her eyes and manage to convince her to go on a date with Soarin' and so she did. And it turned out to be great and so the rest is history they got married after 5 years after Rainbow found out she was pregnant agian this time with a boy which they named Blitz and had a daughter 2 years after who they named Speed Cloud and so they lived happily ever after.