First, congrats on getting engaged. Bari mubarak ho
But i think u really have the definition of “date” wrong…and yeah ur rite love marriages fail …in fact there’s a higher divorce rate for love marriages than arranged marriages. But that doesn’t mean ur not allowed to get to know ur hubby to be before u tie the knot. Let’s say I meet someone where I go to school or work. I like him, i tell my mom, our families get involved, everything goes fine and we’re engaged. We get to know each toher even more and still talk and stuff after the engagement but don’t really go on “dates” ya kno?
Islamically, until you have a nikkah, your fiance is still a na-mehram, meaning if you meet him you must have a third person with you, like a parent or watchful sibling. And also once u have that nikkah u can do watever the heck you want. You can have sex, get pregnant, etc., and it’s not a sin, at least not in teh eyes of Allah. But most people always forget that and instead concentrate on social sins.