I don't know what to do anymore

Alicia
I'm in a 4 year relationship. We've been through more than we should have, but we have never been able to stay away from each other. I love him more than I thought I could ever love somebody. And we currently have an apartment together. Lately we've been going through a bad rough patch. We broke up but still live with each other. I'm on vacation for a week and he said that when I get back, it's my decision on whether or not we are going to continue this relationship or finally just part ways. The last few days I've been texting this guy at work and we've been flirting. I feel bad but at the same time I don't. I recently turned 20 so through my peak teen years, I never had that phase where I did things like this. I don't know what to do.. Does anybody have any advice? 😔