Is my BF cheating or is it just me?

Me and my boyfriend have been dating some time now, he has known to have cheated on his previous GF's and says that he only does it cause they did it to them first, Ive always said to him if you ever cheat on me I would like to know (he a very outspoken guy and does say whats on his mind), and his response was that he would end our relationship if he ever cheated on me and would tell me, Im probably the first girl he has ever told that he loves and he tells me everyday that he loves me and always tries picking me up when im down. I am pregnant with his child and sometimes i feel he will not say anything if he has cheated cause he feels like he is only with me for baby, which he says that he is with me cause he loves me....Now for the suspicions....... we had a few nights apart (cause we live seperatly) and one night i was stopping at his house and next morning when he went to work i found an empty condom wrapper on his windowsil, from which he got on a stag night out, and next to it was an unopened packet of lubricant, i asked him about it and he said that he was exploring what it would feel like to with one on, however, this is coming from a guy who would never wear one during becuase he doesnt like the feel. Secondly we was clearing his car out one day and i found a ladies bottle of deoderant, that was down side of the seat and was not there before, i asked him about it and he said it was from a night out when he and lads went dressed as woment to blackpool then changed his story to when he and lads went on a night out and was only deoderant left in shop and said that it has been there for a while but ive never seen it his car, but apparently it was under the seat and it went there from picking up some rubbish of the floor and fell down side of his car..........next one is the phone scenario, if he is texting someone who is a bloke he clearly textes in front of me not a problem, but if his phone goes off he checks who it is first and sort of hides it in a way so i cant see, although i dont ask to look im not like that, but if my phone goes he always asks who has texted, which im not bother about i text in front of him no problem ive nothing to hide, and he is a bit of a ladies man too, He insists he would never cheat on me and that he would tell me if he has but i dont know if thats enough sometimes, i just dont know what to think, maybe im just over reacting cause ive been cheated on before i dont know........ advice would be very helpful right now.