I need advice or something.(please read)

So... I'm a 25 year old.... I only had 3..? "serious" relationships.. (maybe none i don't really know to be honest) I sorta lived with my first one, but we were fighting nonstop like every single day for 9 months. The second one lived with me for 5 months but we were dating 6, he started a new job and started hanging out with 'new' people and he ended up cheating on me.. he left and went to live with her I'm sure, I don't know completely but it's a feeling, they 'dated' after but I was told she was a hardcore lesbian. Anyways... then I was with another guy for a year and three months... he wouldn't commit to me but again he told me I was the only one & I was stupid enough to believe it like an idiot... I found out he was cheating on me the whole time but yet was mad when I hung out with guy friends, he even broke his own phone when I caught him talking to his ex girlfriend he told me he blocked.. then I caught him with his now baby momma 🤗 and never talked since... now what I'm getting at is, I've been cheated on, & used, lied to & etc... how can I finally feel good enough..? I'm in a relationship right now & I don't really wanna mess it up cause my insecurities... and my over thinking... and always think it's gonna happen.. how can I fix this myself..? He seems like an amazing guy & I honestly wanna spend the rest of my life with him, but my overthinking is getting into the way and it's draining me & I think it's draining him as well & I don't ever want that to happen.... I'm honestly scared I'm gonna push him away cause is this...