advice needed!!!

so i’m 14 was 13 at the time just turned 14 and my “bestfriend” is 16 and we had a party a few months ago at her aunts house because she was out of town and got drunk and so this 16 year old guy i was talking to came and we was all kissing and crazy the whole night and we went to the bedroom and he had sex with her right beside me while trying to kiss me. i kept turning my head and like 2 minutes later i got up walked to the bathroom locked the door and started crying and texted my ex i needed him and shit and she came in there and i can’t remember what she said (obviously because i was drunk) and me and the dude stopped talking the next day and my 17 yr old ex came over that night and we had sex and shit and he stayed till like 4:30am then left and fast forward to now i’m talking to the dude again and his ex left him for his friend and she was thinking she might be pregnant and my best friend hasn’t had her period since then and today he calls me and says his ex is pregnant and she don’t know if it’s his or his friend and if it’s his she’s gonna get a abortion and my best friend picked him up today to go take a pregnancy test and the first said positive and she drunk a sweet tea really fast to take another and the box’s say don’t do that and it came out negative so she’s gonna take one in the morning and he calls me and says “i gotta deal with this” “if you choose to go down this road with me is your choice” i said what happens if she’s pregnant? he says “we’ll figure it out then” what do i do? i really really like this boy and he’s the sweetest most caring. and the first person i’ve actually liked since my ex who broke me. complicated situation i know