should i be bothered?

so my boyfriend who has a female friend who i’ve yet to meet. before knowing of her existence she called around 330 in the morning while we were on vacation then he went out of his way to go visit her at a bar that she works at w/o me bc i was working (but to me you should’ve waited till i was out of work, so i can meet her) but no he waited till after...

so i’m bothered right. i got off that night at 10 and he was fully aware being that i had told him hours prior & what do you know his phone is dead. i waited up till 1230 when he finally decided to show up. he goes to sleep & i check his phone bc something deep down told me to check & what do you know... he planned to go see her & before that she invited him to her apt to see her new puppy even tho she had already sent him a picture of it. he “i’m down” & then she said she had to be at work at 6 (the bar he went out of his way for) & he said “nvm i don’t want to be there for just 45 minutes i’ll just go see you at work” which he did & she was so happy about it & then invited him (just them 2) out to have drinks at Twin Peaks if she got out early & again he said he was down so at this point i’m livid, really contemplating whether or not i was beat him ask him wtf is wrong with him when he woke up i asked him & he said he was gonna tell IF he went. & i’m like wtf why would wait till your there to tell me what your plans are. to me it’s disrespectful so i get over it & then fast forward to a few months later we get into an argument & felt the need to tell our friend & HER!! our friend was switzerland & the other female had a mouthful to say. he of course showed me the message our friend said but when it came to those messages he snatched the phone out of my hand i was like ohhh really

i’ll just wait till you go to sleep to read the messages & guess what? the messages got deleted & only hers i might add. so i’m like fuck it! i don’t like this girl i know she’s up to no good. & whenever i get a glimpse at the messages they to me seem to be very flirtatious. i’ve told him i’m not comfortable with them texting but i also understand that that was his friend & i don’t want to be that kind of girlfriend but it’s progressively pissing me off more & more. do y’all think i should let it go & try to like her & do y’all think it’s a little suspicious & should i be worried??