Although it's not the most inventive or romantic method to pop the question, texting someone to propose can work wonders if done at the right time. It can be a smart idea to pop the question via text during a close conversation if you are feeling particularly connected to each other.
If the connection you share is one of sincerity and passionate words, then choose those over fancy ones. If you think it would be suitable, you can also choose amusing, adorable, or romantic proposal lines.