Can you tell me what you think ?

My husband couple months ago was acting funny trying to hide his phone and always mad he said it was all the problems we were having . One night I heard him taking to his mike from Xbox to a girl he said no but the camera record him and you can see that he was trying to test the mic so doesn’t pick any sound ? Tell me why? Then I heard him said like but that means I have to go ? Still got my pussy ? Ok the. I ask him he said is was his frien mike .. I didn’t tell him about the cameras . Because before he used to take me to the mall and when he came back home he used to disconnect. Then put it back better he went to pick me up . Few more weeks he was acting like he done sent want me to check his phone when since I remember he wasn’t like that . ... so I decide to investigate then I found a invitation card for some kids party it was his friend but he didn’t show me that card . So I Went to his Instagram and I found the friend that give him the card check his phone bill , he was talking to her more than me texting more that me . He said it was a coworker but I still was having the feeling that he was Lying to me . But still didn’t have enough proof until the other day . We were having a lots of problem and he always blame it on me that I didn’t want him or always fighting. Yes we used to fight and sometimes I was tired to do what he want it . But we still do it ... well decide to change because I feel him that he doesn’t want me so we were doing much better and he just keeps telling me that I’m going to fix things . So one day he took me to food shopping but I went real quick ,so he pick me up and I see a text saying . “She text him hey stranger he goes hey stranger I’m sorry they came back sooner that i aspected and the little ones want to come with me , I’ll try to scape later but if I can’t be safe at work and remember you always in my mind “ so I asked him he said that was nothing . That he was trying to fix things that why I was trying to look for stuff. I got suspicious when he Suddenly he ask me oh baby we don’t have to much things in common! I was like what acre 11 years you are asking me that ? But apparel is a friend that he gets along but it was nothing just talking . But it’s hard to believe him . And she put stuff in Instagram cites like love is hard is hard to love someone that is taking . I don’t know what to do he said he loves me but he text that recently that , to me he was not trying to end anything but he said he was little by little . We have 7 kids almost 12 years together and married . I don’t want to lose him but it hurts