My ex and I still have feelings for each other, but he is emotionally unstable. What to do?

wonderful-mess
This is about my ex boyfriend and what I should do about him. I will give some background info so you can get an idea of the situation, so here goes; My ex and I met at school almost 3 years ago, and liked each other from the very beginning. After 6 months he asked me out and we were together for 15 months. Everything was wonderful, but we got in some rough times and took a break, but made up and started dating officially again. Last October, we had been together 20 months, we broke up. We have most of our classes at school together, but I stopped all contact with him for some months. We started talking a little at the end of December, and ended up making out New Years Eve at a friend's party. Since then we have been talking more and more, these last few weeks practically every day. We have also been on long walks and talked a lot, on these walks he has kissed me, and he says he has feelings for me again. I was really happy about this, because I have been having feelings for him as well.

We have both had some problems, and he still does have some, I think mental problems (nothing large), but he is very confused and has been extremely emotional the last few months, he is open about this too. The thing is that he isn't "ready", I'm not entirely sure about what, but I'm fine with it, as I know there will be doubts about if our relationship could work again. I try to be helpful because I know he is going through some rough times and he gets hurt VERY easily, and then doesn't want to talk to me. How can I go about this? I feel like I have to walk on eggshells every time we talk and it's dragging me down emotionally every time he gets upset about the tiniest thing. Should I stop all contact with him till he gets better or what can I do. Keep in mind that I care very much about him and if possible I would like to have another go at a relationship with him. If this means anything, he is 18 and I just turned 19.
Updates
+1 y
Hi, thanks for all the answers, I appreciate them. We have talked about it, and he thought we should try it as girlfriend/boyfriend again, and it's actually going really well :)
My ex and I still have feelings for each other, but he is emotionally unstable. What to do?
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