 If you liked
Kidou Senshi Gundam: Dai 08 MS Shoutai
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 ...then you might like
Kishuku Gakkou no Juliet
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If you like the stories of Romeo and Juliet, GUNDAM: THE 08th MS TEAM may interest you. 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 so it is not necessary to have seen any other anime from that franchise.