 If you liked
Kidou Senshi Gundam: Dai 08 MS Shoutai
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 ...then you might like
Koi wa Sekai Seifuku no Ato de
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Both stories are based on the Romeo and Juliet narrative.
Gundam: The 08th MS Team it's 'Romeo and Juliet with Mechas'. The boy is a Mecha pilot of the army that defends the Earth... and the girl is a soldier from the faction of humans who live in space that attack Earth. They will face an impossible love.
(It is a spin-off of the Gundam saga but being an independent story it is not especially necessary to watch any other anime of that franchise)