There's one anime that I remember watching, however I cannot remember the name. It was about a boy and a girl who had known each other since they were very young and proposed to each other?

Ok there's a few a animes out there that a have a growing up story but off the top of my head the only romantic One I Can recall watching was a series called tons guru though at the begging of the series its reviled that yuji the boy kazuki loved has now changed for the worse which depresses her but as the series goes on he gets less insufferable but I won't spoil anything else.

If it wasn't the correct anime I recommend it anyway as it was pretty funny at times also if it's not the right anime is there any other descriptions you can give off like characters plot or something anything again sorry if it's not the correct anime.