Would you give him another chance?

A month or so ago, my ex broke up with me while having a mental breakdown. He took it back immediately but I made ya stay true to it. He’s bipolar and suffers from depression. The whole 3 year relationship felt like I was begging for his attention and for there to even be the romantic sides of a relationship. He never changed at all during the 3 years. When he broke up with me I felt kind of relieved because things felt dark on my side for the longest just feeling like I was never good enough. He regrets breaking up and is going to therapy and says he wants another shot to be a good significant other to me and to treat me right. He says he will make a change in every way and fix all of the wrongs in the past. I met this other amazing guy who already treats me exactly how I was always begging my ex to. I feel so torn up on giving my ex a chance, because after all... all I wanted was for him to show me love and affection, the list goes on... and now he’s promising change. Do I give the old another try for what I’ve always wanted with him? Or do I try something new and give someone else a chance who is already giving me what I had been begging my ex for... feeling so torn up.