i feel like im always in the background

[xJx]

another rant! havent been on here for a while but i know where 2 turn if im feeling a bit down. im getting a bit fed up with my bf. he has a child who is 2 years old and has weekly access on 2 weekdays and on a sunday. we want to go away this weekend over saturday night so he has asked to change the day that he has his son, to the saturday morning instead so that we can spend more time away and dont need 2 rush back on the sunday. it turns out that he has told his ex that he has a family do on the sunday and not that he was going away with me. it just always seems that still after over a year of being together he has to lie to his child's mother about seeing me. he thinks it is because if she knew he was changing the day for the baby because of me then she wouldnt agree to the different day. i asked him today y he always makes up different excuses and its like he doesnt want to upset her. she wouldnt be upset by it anyways because she has a new bf as well. he is keen for us to get a place together but what is going to happen when the baby comes to visit and im there. will he always lie and say that iv gone out or just not tell her that im living with him!? even when we go out for the day, i can tell he is always looking around to check that we dont bump into her or any of her friends. im just getting fed up of always being in the background. im 100% positive that he doesnt want to be with her as she treats him so badly but why is he being like this!?