The construction of the verb 恋爱 is, like in English, to be in love + with + object (and not "to be in love" + object). Therefore, you can't say 我会永远恋爱你. In fact, to say "I will always love you", Chinese speakers would rather say : "我会永远爱你". (Please see the difference between 恋爱 and 爱 below.) The construction of a sentence using 恋爱 is : subject + 和/跟 + object + 恋爱 For example : He is in love with you: 他和你恋爱 / 他跟你恋爱 (同你恋爱 is less frequent) Other examples: 他和他女朋友恋爱了2年. He has been in love with his girlfriend for 2 years. 《真的恋爱了》is the Chinese translation of "Love Actually" (the movie). 恋爱 usually means "to be in love", not "to fall in love" (爱上). However, there is a difference indeed between 恋爱 and 爱. 恋爱 is more often used at the beginning of a love story, later as time goes by and your feelings get stronger and stronger, then you know it's love (爱). 恋爱 is also more selfish, it is something the person feels in herself, whereas 爱 is more generous, it is something you offer to the person you care for.

1 A和B恋爱了 形容词 2 A和B谈恋爱 动词

the verb 恋爱 is a situation of 2 person who loving each other, the point is that both 2 person love each other, not one person's thing. In chainese, we always say 谈恋爱 you could say: 我会永远爱你吗?（Will I always be in love with you?） because this is the thing of you, maybe he/she doesn't love you 他和他的女友是真的很相爱! (He and his girlfriend are really in love!) it describes how love they are.

如何正确使用中文动词恋爱？比如，我可不可以说：我会永远恋爱你吗？ 本句两个错误：1。通常我们说 我爱你 而不是我恋爱你 2。你这句话是疑问句：最好别用会。要用能！我能爱你吗？ 会表示肯定的意思。如：我一定会爱上你的！！

i try to explain（my english level is easy to uanderstand，hard to expressmyself）。 恋爱 is more means in certain relationship。eg。you can say “我恋爱了”which means im in relationship or i fall in love with someone。 so i guess when you want to express this relationship ，you can use “恋爱”。 and you can say他和她（not他的女朋友）是真的恋爱了（he and she are in relationship。）恋爱更强调恋爱关系