Marrage - should i say yes ?

we have inside jokes, fooling around, tickling eachother and just acting like retards around eachother and in public, picniks in the park, cinema, he sells his xbox to get me a birthday presant and take me out, romance, he took my virginity last month, we spend everyday together, together for 2 years and we're both 15, hes never even looked at another girl around me, we were best friends since nursury before our relationship had no problems in the past- hes planning on proposing when we're 16 should i say yes? and is this truelove ?