Me (20F) and my boyfriend (21M) have been dating for a year now, earlier this year around early may i caught him chatting with an old highschool fling of his, I gave him shit for it and he promised he wont do it again or something stupid as cheat again knowing he “loves” me and its made him realize that ive been the first healthy relationship hes ever had. I learned to grow from it and not dwell on him doing shady things in the sense that i want to trust him being a good man(i tend to overthink and want to have a positive healthy relationship so im also learning to allow my partner to be themselves and their own person in our relationship)   
Tonight feels like a final straw for me tho, hes staying the night bc his place doesnt have ac and its a hot summer night so i agreed to let him stay the night and take care of him since he’s sick rn. I also had a moment of weakness and searched his phone to see if he ever texted her back or continued flirting   
and not so surprisingly   
he didn’t text her, but he did text other girls again  
not just that but his private gallery had a lot of porn pictures and naked women  
including pics of his female friend who he’s constantly been open about and who ive been trust worthy of  
just pictures of her and random internet whores

Im honestly shaken and heartbroken at the moment and it really pains to thing this might have to be put to an end because i really love him but he just doesnt seem to feel the same if this is the case

He has helped me and my family so much and i have supported him in any way i can in his interests and hobbies and its really heart wrenching knowing hes still doing immature and just disrespectful things like this  
i dont know who to tell or even vent to about this because everyone is so happy for us seemingly very happy in our relationship   
which we are  
until tonight.  
I guess im just looking to see how to handle the situation in an adult manner  
we work graveyard shifts together so i dont want it to become awkward and our coworkers and bosses know we are a couple, i dont want it to affect our jobs but i also dont want things to turn out to end this way..

Cheating Partner