In Romeo and Juliet characters are young and inexperienced. They are still teenagers, they are still learning what true love really is and feels like. Juliet is 13 and Romeo is 16. I Romeo was just caught up and wasn't thinking when he married Juliet. He was acting rashly without thought when he married Juliet who he has only known for a very brief time. Also he was extremely depressed and in a state of sorrow about Rosaline that very day. Romeo was not in a state of true love. Romeo was excited to have requited love and to feel so immensely happy since had been such long time. He was to caught up in the moment and acted rashly.
Romeo and Juliet are young and don't know what true love is yet and they don't have enough experience to logically make theses drastic decisions. Marriage is something that if it isn't right, you can't just bail, it is a commitment to someone you know and have loved for a long time. Romeo isn't thinking of the consequences. For example in Act 2.3 lines 61-62 Romeo says " If Romeo was truly in love and his whole mind was set on Juliet and he wouldn't even think about Juliet being a Capulet. If the love was strong enough to get married so quickly then he wouldn't care about her being Capulet and ignore the fact shes his family's enemy. He thinks he is in love but when it comes down to doing it he isn't ready deep down. Romeo is obviously acting rashly and on haste if he admits it himself. In Act 2.3 line 200 he says, "O let us hence. I stand on sudden haste." He even admits he is moving fast and and is in "haste". Romeo knows he is moving fast so obviously he isn't thinking he doesn't want this to end or stop because for so long he has been deprived of true requited love. He obviously is blinded by what was happening with Rosaline, since that was so bad, this is such a big improvement. In Act 2.3 lines 48- 49 he says " Rosaline? No. I have forgotten the name and that name's woe." he says "woe" so obviously he had love for her and before that day in Act 1.4 lines 19-20 he said, " I am to sore enpiercèd with Cupids shaft to soar with his light feathers, and so bound" He was depressed and in sorrow because he loved Rosaline with such passion, he refused to even try to find new love. He was ruined but now he has a new love who gives him love back. So his mind is muddled and hazy, he isn't thinking straight. So a decision to marry the daughter of your arch rival who you've just met, cannot be a logical decision that was from true love.
Teens are young and inexperienced when it comes to love. When you are 16 you don't know what true love even is. You are still young and reckless you make rash decisions that might not make sense. Not always little, in Romeo and Juliet he isn't thinking logically, he is caught up in everything that's happening. He doesn't have a calm life to think right, he is still young. When he marries Juliet he was being irrational and hast. If he was really in love he would have waited to make sure their love was right and to make sure it lasted. Romeo rushed and was acting out of muddled thoughts and rash decisions.
