Fighting

I had gotten back with an ex of mine. we had only been dating a week and already fighting a lot. and now he isnt sure if it is gonna work. i am not sure what to do. i want us to improve and make it work this time. but its also a bit hard with my mental health. and the distance. i am not really sure what to do. and its been very hard. especially trusting him. cause he has cheated in the past so trust as well is something we dont really have.