dealing with the suicide of someone i once thought i was going to marry 💔

kylie
so a month ago, a guy i was completely in love with killed himself. we were best friends for almos 7 years, and i was completely in love with him. i would've done anything for him, and he was always on my mind. anything i did, i did it with him in mind. we both always had feelings for each other, but we always jus stayed friends. we were kinda best friends with benefits. but i thought that i'd marry him one day. i just saw that in our futures.. but now he's gone, and i'm having the hardest time with it.. 
my school counselor recommended therapy with everything i've been through throughout my life, and now adding this to it. but i don't know how to talk to my dad about maybe trying out therapy? i have no idea what to even say to him. 
please help. ❤️️