Breakup with an avoidant

We were really in love for 3 years and I almost did not pay attention to the orange flags that he was an avoidant and dint know how to handle his own emotions he would process it alone withdraw emotionally i thought it was normal untill we hit a breaking point after 3 years when we decided to get married and I wanted a space of my own while his parents wanted him to stay together he finally decided to not go against his parents and choose comfort it's been 2 months now and he's already checking compatibility with someone else this is after i offered to lower my standards and stay together for the sake of love and I found of he finally moved on faster and quicker it makes me feel so bad