I 15m am having some struggles with my relationship he is also 15m

So me and my current partner have been dating for about just a day ago we hit a month. now i have been having some really complicated feelings per say so, my partner ill be honest is very emotionally unstable, hes a confirmed sociopath he also suffers from a lot of trauma and depression and, at first i didnt think this was to much of an issue because i thought “oh everyone has problems” but thats not the case, he has said to me multiple times that he has suicidal thoughts, and ADMITTED that he also hurts himself (cutting) whenever he is stressed, and i of course dont enjoy that its not something i want to have to think about and, im constantly having to reassure him and try to comfort him to a point where im becoming slightly emotionally exhausted and i dont really know how much longer i can deal with it. But theres another thing here which is something going on with me, so before i had gotten with my current partner i had broken up with my last partner about two months ago, and we keep in contact as friends of course, and i get it thats kinda fucked up still talking to them but we established that nothing would happen and that he wouldnt get between us and my current partner but as you can probably guess thats not what happened, so basically me and my ex partner were talking one day and the subject of our past relationship was brought up and we were just casually talking about it like about some things that happend and some stuff about why it ended, and for some context me and my ex had split up because they had just COMPLETELY stopped giving me attention right just straight up ignoring me, and while we were having this conversation about our relationship he just flat out told me, that he still has feelings for me, and i was thinking to myself “why now out of all times why right now” because after he told me that a bunch of feelings just kind of erupted from me and ive noticed that, i still have some feelings for him too hell i even asked “if i did ask you to try to make it work again would you do it?” And he responded “yes absolutely id try my hardest” and i am just really taken aback and i dont know how to feel. And back to my current partner on how i said hes very emotionally unstable, he said to me once that im like the one thing keeping him happy, so i feel a bit stuck here, i think im losing feelings (i dont really know for sure) but if i were to leave id be worried about what he’d do to himself and ill say this as well, i had already tried to break up once which was for a completely different reason (if you want those details ask). But after that we ended up staying together because i wasnt ready to let go of him i realised i didnt really want to but now im thinking to myself, “am i really happy and do i want this still” and the thing is he has said he swears if we did split up he wouldnt do anything to himself but, how am i supposed to know that? How can i believe it? But to sum it all up, im inbetween two very complicated feelings, I still have some feelings for my ex but also am feeling weird with my current relationship and how its been going with how im an emotional crutch for him and this happens every day where he goes on about him having these suicidal thoughts almost every day, and i dont know how much longer i can really take it and i feel like im forcing love for him more and more each day. Someone please help me i dont know what to do