Honest opinions, should I officially leave? 😪

I’ve been in a relationship w/my sons father for about 6 years now. Our son is 4 years old and on the second year of our son lives that’s when all the cheating & lies began. I don’t want to get much into detail but I loved this man with all my heart, it all began when he tried to date one of my old HS “friend” it ended all bad, just to make it short. I took him back after that. I couldn’t forget I forgave him but the thought of him wanting to date her stayed in my head. Every time we argued I always threw it in his face which is why he “left for a while”. I found out he was clubbing & living the single life.. we tried to work things out again but he was just doing messed up things to me, for example when I bought my brand new car I let him drive it because at that time he did not have a car, guess what he did? He picked up a girl that HATES me in my car. She was posting it all over Snapchat. I forgave him. Now 2018 was the worst. I found out he slept with a girl that went to my school at that time. I forgave him. He went on a date with our son & his ex. More than once & I forgave him. She later confessed that he wanted to sleep with her but she refused too after finding out we were still together. Now the last he did was break up with me over a girl he hung out with once. They were basically clubbing partners and every weekend for about 4-5 months they were going out. This BROKE ME. After seeing those pictures & videos of him it broke me into pieces. But guess what? I forgave him because I never loved myself enough to leave. Now for the past 3 months everything has been going “great” but I’m not happy anymore. I felt like I was putting so much effort into the relationship and he wasn’t. I didn’t feel loved enough. And I was always afraid that he would leave just like the other 1000x he did.. So about a month ago this guy I know from HS messaged me, we started talking here & there but I didn’t give him much attention. About 2 weeks ago I went through my now ex phone and found pics & videos of the girl he left me for, I also found msgs where he’s telling a girl “to hang out” and that she had “beautiful eyes we would make a pretty baby” I felt like that was it. I left. I now talk to this guy a lot. I plan to go on a date with him, but my ex found out and called me all these names, he told me I was SLUT & a bitch for leaving our “family” his words honestly got to me and now I’m so confused. I do believe I “love” him but I’m so scared to start all over...

Any advice would help 😔