Help!

A

My boyfriend of 2 and a half years ended our relationship three weeks ago for the second time (first time was jan 2019). I was devastated but because I’ve been through it with him before I was actually doing okay after a few days. About a week after we ended a guy started speaking to me on social media and hes been messaging me everyday since saying he wants to meet up with me soon and that he can’t wait to see me (he’s been single for two years) and I really do want to meet him and see what hes like as he seems like a genuine guy, I feel like when we talk it’s on a mature adult level, different to my ex. But now my ex is saying he regrets it more than anything and he wants nothing more in the world than to be with me and he knows he’s fucked up but promises it won’t happen again as it’s been a big wake up call. He says he’s been depressed and feeling so down and cant stop thinking about me. This has made the situation so hard for me I literally don’t know what to do. There’s a risk if I go back to him because we could split again and I could lose a good guy (the new guy) if I dont give it a go as il never know but I just can’t stop thinking about my ex and wishing none of this happened. I’m so stuck I feel like im in a no win situation :(