I feel lost

My wife and I of 11 years separated a month and a half ago( we have kids). I knew this time was different but she keeps coming to me for emotional support and since she was my only friend I kept caving, and we ended up sleeping together last week. So I kept holding on to some kind of hope i guess that it would work out somehow until I ran into her friend that said she was on a weekend long date (my time with the kids) and has slept with multiple other guys.. in the 6 weeks we've been apart. It feels like getting my heart ripped out all over again.