You did say it was the first time he hit you, but was it also the first time he has exhibited overly aggressive behaviour like as you described, squeezing your arms, pushing you, threatening you and anything of that nature?

If not, is it usually when he's drunk?

If it's the first time he's done such things, you need to talk to him about what transpired. Preferably heartfelt conversation over argumentative.

If this is regular behaviour, or at least common enough to affect the relationship significantly, that's something he needs to work on with a proffessional, imo.

Furthermore, looking into his phone.. have there been distrust in the relationship? If so, are you distrustful of him moreso because of his actions, or your past relationships? Maybe neither?