Lost.. what should i do

So last night i caught my husband red handed texting his ex girlfriend while we were out for dinner together. I was petrified, beyond words. We had a full blown argument at home. He lied about how long he is been doing this ( he said just 2 weeks... lies it went on for a whole month) i got hold of his fone which he gave after i said i wouldnt forgive him until i knew the extent it went to.

I asked if it was just txting or did they call each other. He said they never called. Again lies calls ranging from 21mins to 47 mins multiple times a day. And our call durations were just in seconds.

I asked if they met in person and they said they planned too but not yet.

From his answers to my questions its as if he doesnt love me and care more for her.. he told he will stop being in touch with her. And he believes in out future together. But i thing he has feelings for her.

I knew something was off, my instincts told me from beginning of january.. usually he uses his fone just to scroll through insta n fb.. but lately i found him texting late at night. I trusted him with all my heart and dint nag him at all about it. Guess i am the fool.

I dont know what i am supposed to do. I love him with all my heart.

Help!