Leave or stay?

So for the past 4 months, I have been struggling with my ex. I broke up with him due to my mental disorders getting worse and classes being demanding. It first became a break, because I just need some time to get in a good place, plus he needed to work on maturing and other issues as well. At first he was okay, and we were really good for awhile as friends. But then his mom and friends got involved and filled his head with lies, making him resent me.. We agreed that if we wanted to date other people, we would talk about it first just out of respect.. I had no desire of dating and was serious about improving on myself..Due to his mom and everyone, they told him I was just using him and that he needed to start dating..mind you this was 2 weeks after the break/breakup.. We were then only allowed 2 days out of the week to see eachother, and honestly didnt last long. He and I were good for a little bit, and I respected his wanting to date girls.. But then after awhile, things got heated because of his mother disapproving of us and making things very stressful. He took her side and never stood up for me or us.. I then blocked him on everything, and we saw eachother only on Thursdays for league(on the same bowling team). Due to this I got plane tickets for a last minute trip to Arizona to see my cousins to get away for a bit and get some clarity.. Before I bought them though I told him and he was fine with me going. The night before my flight, he and I got into an argument because he didn’t want me to leave..He then said that he wanted a future with me and nobody else. I still went and agreed to talk to him everyday..While I was there, one of friends that I met a month before the breakup, confessed his feelings for me(more info about him in the comments). I told my ex when I got back, and he said he would not want to be part of my life if I decided to date this guy... So now I’m very confused and in a tough place, because I’m still in love with my ex, but scared of getting back with him because I’m just not ready and feel he isn’t ready either.. And I honestly want to see what happens with this guy, but I’m scared that he isn’t really into me like he says..

My ex has improved a lot, but I don’t know if I should date him again, or if I should even date at all.. He is honestly my best friend and has been through the darkest times of my life, so I don’t know how to really move on from him..

Help!