How to do a relationship “restart”?

My relationship of 1.5 years became
Extremely toxic within the last 4 months. My boyfriend and i have argued constantly and broke up a few times (due to me getting jealous over social media). I found out recently that he has been having doubts about the relationship because of it (i also feel lied to. But, that is another story). Anyways, we have both agreed to work on this and start over. How do we go about it?
How to do a relationship “restart”?
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