My boyfriend constantly lies to me?

it's long -- sorry!!! back in july my live-in boyfriend trained for a job, and exchanged phone numbers with the girl who trained him. we share a phone bill, and one day as i was looking through the bill, i noticed they had been texting for about an hour one night. i asked him about it, and he deleted her number... show more it's long -- sorry!!!

back in july my live-in boyfriend trained for a job, and exchanged phone numbers with the girl who trained him. we share a phone bill, and one day as i was looking through the bill, i noticed they had been texting for about an hour one night. i asked him about it, and he deleted her number immediately, saying nothing happened and he was not interested in her. (note: her name was programmed as PAUL in his phone!!).

well now, my boyfriend started a new job two weeks ago. he exchanged numbers with a co-worker of his (whom he originally programmed in his phone as ANTHONY) and i wasn't mad about it because they rarely talk. (never on the phone, just text messages. sometimes he doesn't respond, sometimes she doesn't). well, he told me this girl was married, nothing to worry about. one night we were out with a bunch of friends, and i asked two of the girls he works with about her. they both told me she wasn't married, so naturally, a fight broke out between him and i. tonight it dawned on me that ITS THE SAME GIRL WHO HE WAS TALKING TO IN JULY!! i called him while i was at work, crying, and asked him what was going on. he tried LYING to me, saying it was a different girl. when i told him the phone numbers were IDENTICAL, he then confessed, saying he worked with her, but NOTHING is going on, blah blah blah. eventually he turned the fight around on me because i shouldn't be looking at the bill. (but when it's $40 over what it should be - i have every right!)

i mean, i know i can be jealous, but what do i do?
believe him?
or leave him?
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