How can someone go from saying they wanted to ask you to marry them to calling you out of your name and saying hurtful things when angry?

Full post with detail is in pictures.

I just need to know if I’m being dramatic or if I have a right to feel disrespectful, upset and invalidated?

Back story: dated for 5 years, found out after our twins (which he begged me for a baby while being unfaithful) that he was cheating for the last 2. Tried to lie even tho I had proof. Finally admitted to it & apologized. Kept finding sketchy stuff on his phone. Now b/c he goes to work & comes home he thinks he’s done everything to gain my trust back. I’m not allowed to bring it up, tells me to get over it & leave it in the past. Anytime I try to talk to him about my feelings or if he upsets me, he shifts the focus on me & what I’m not doing which I take into consideration but believes he’s doing all he can even tho it’s bare minimum effort. I tell him I need his reassurance b/c of the betrayal (all 3 girls didn’t look anything like me) & tells me to grow up & that I’m insecure & I need to work on my issues. Says he doesn’t have to proof anything to me when I ask to look through his phone for reassurance & it’s a red flag b/c if he wanted to gain my trust & reassure me.. it wouldn’t be a problem if he wasn’t doing anything shady.
How can someone go from saying they wanted to ask you to marry them to calling you out of your name and saying hurtful things when angry?
How can someone go from saying they wanted to ask you to marry them to calling you out of your name and saying hurtful things when angry?
How can someone go from saying they wanted to ask you to marry them to calling you out of your name and saying hurtful things when angry?
How can someone go from saying they wanted to ask you to marry them to calling you out of your name and saying hurtful things when angry?
How can someone go from saying they wanted to ask you to marry them to calling you out of your name and saying hurtful things when angry?
How can someone go from saying they wanted to ask you to marry them to calling you out of your name and saying hurtful things when angry?
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