overly jealous

hey guys.. im feeling really low today. my boyfriend is friends with a coworker who is a female (if that even makes a difference) and i have expressed that i dont like how often they text eachother. it is what we fight about.. keept in mind we all work together. i always feel left out because of how often they talk to each other. i always get paranoid that they will catch feelings for eachother, so i always passive-aggressively start fights with my boyfriend about it. sometimes i feel guilty and sometimes i don't. i just get really insecure when they are around eachother. i secretly check their messages.. i know i shouldnt but i do. they always ask if they are okay.. and i also get paranoid that they confide in eachother when my boyfriend and i fight. i was so down today that i barely spoke to my boyfriend. we got in a little argument and he left the house then came back an hour later.. i secretly checked his convo with her on his phone amd everything was deleted except their recent messages where she was venting to him about her long-time boyfriend and how she tries to make it work. i dont know why i feel like this.. i dont know if i should bring up why he deleted his messages.. i dont know why im so jealous and insecure.. when i see that, it closes me off from my boyfriend and i get so cold. i expressed to him today that we dont talk anymore.. and he suggested that i should stay with my mom bcos we are around eachother so much and he said that i pronably needed my space. i kept hinting thst i didnt feel good and that i wanted him to show more affection and to talk to me.. and when he tried tonight, i judt pushed him away. im scared the more i push him away, the more he will confide in her.. im tryinf not to bring up the fact thar he deleted messages.. i keep telling myself that whats done in the dark will come to the light.. but.. idk. i dont know whats going on. i dont know whats wrong with me