i've been going out with my girlfriend for 12 months. we have a good relationship and have had some arguments but nothing major, neither of us have ever cheated.

i feel quite insecure when she goes out with her friends from work and in particular this one guy, i found out she told him she fancied him a while back and she said it was just because she needed to find out and she doesnt like him whatsoever. anyway, about 4 months later, now, last night...

i had a bad day yesterday and she was supposed to be going out with work last night but she was ill at the weekend and said she wasnt going. she came home last night and we spoke, she said she is feeling a lot better and she wants to go out with them, asking if its ok with me. i didnt really want her to go because i really wanted to see her, we had a bit of an argument, she said she wasnt going but she was annoyed, anyway, i hung up then called her back, but she'd gone.

so i told her it was over, as we had an argument earlier this week. at first she said i was being childish and it wasnt really over, but then she realised i was being serious. i didnt really want it to be over but i was just so angry. anyway, we didnt speak all night.

today, we kind of made up, but then i found out that she'd told the people she went out with that she had broken up with me, she was quite upset and cried, and they helped her out. but, she was talking to this guy who she told she fancied before. they must have been flirting a bit, and i saw some text messages. one said "ive lost the bet, i didnt get any action (to the guy from my gf), and in another she asked him if he wanted to go out at the weekend, and the final one was to another one of her friends saying 'do you think i should tell steve (the guy) about how i feel?". he replied "yeah go for it you have nothing to lose".

when i found out she was very upset, and said she wanted to get back at me, and she doesnt really fancy this guy at all and she loves me. i wanted her back too, so we made up, but i asked her to cut down her hours at this place, not go out with that guy ever again.

she has quite a problem with sacrifices, she doesnt want to leave her job because she really likes it. she wont even call in sick for one shift to see me. she says she loves me, wants me, and wants to sort things out and spend her life with me. id like the same, i think, i have thought about splitting up, but it'd be hard, and i dont really want to.

what should i do? am i being played for a fool?