I need major help!?!?

I’ve been in to men for the longest time I mean when I was younger I had a stage where I thought I might be bisexual but I snapped out of it real quick and that was back when I was prob in elementary and on occasion growing up id find a girl here and there attractive but I would have never considered dating one, until I met my bestfriend, we’ve been friends for a little over a year now and me and her both have never been so close to anyone in our life’s ever, shes the type of person that she doesn’t keep people in her life for long usually just a few months and she gets rly tired of ppl but she’s never got tired of me or pushed me away and I’m not sure what to do BC we’ve talked abt getting married but we’re always joking of course which I mean halfway joking we have made out on A few different occasions but we have been fucked up every time I mean it was intentional for the both of us but still I mean we’ve never rlly talked abt our sexual preferences but I’m pretty sure she’s 100% straight and idk what to do