My bf is devastated because I lied to him. I wanted to apologise but he doesn’t wanna see me.

My bf is 40 and lives with his parents. I am 35 and live by myself. We have been dating for over a year now. Since the very beginning it was hard with him because the first three months he didn’t wanna stay over and sleep at mine because his mother is very controlling.His mother didn’t meet me until two months ago but all along has been very much against me and our relationship. (http://relationship.My)I always had arguments with my bf because I didn’t really feel comfortable with him jumping over for an hour or two and then going back home to his mother. He kept promising that he was gonna stay at mine and start spending more days over at mine but this didn’t happen. He is also a lawyer, so he has a lot of work to do on a daily basis and on top of that on weekends he spent time at his village with his brother doing some building work there. This went on for many months, almost a year in this rythm. Empty promises that he would start spending more nights with me but not happening. His mother threatened him that she would kick him out if he decides to stay with me and that he should forget about her. This story went on all along. I told my bf many times that I wasn’t happy in our relationship, that I would like us to spend more time together over the weekends to which he said that he understands however he has urgent work to do and has to do it. So nothing really ever changed. In the middle of October our relationship was very shaky and fragile so I decided that I should start going out more instead of clinging onto him all the time. Since I am new in the city I posted an add in an expat fb group that I am looking for like-minded people to socialise and go out with. One guy sent me a message that he is also new in town and has the same interests as mine. We started chatting with each other but I didn’t tell my bf about it. After a week of chatting I met the guy for a coffee, the following day I went out for a walk with him and we continued chatting. I met this guy three times in total before we went out dancing but it was 5 of us that went out dancing from his dance group. I never went out dancing with the guy by myself. At this point I wynted to make it clear and set clear boundaries so I said to the guy that I was not looking for a relationship with him just socialising and dancing and he said he is fine with it so we can stay friends. I also wanted to tell my bf about the guy so that when I go out I can tell him where I am and with who. The problem is that I told my bf that I met the guy in the dance club that same evening and didn’t tell him that we met a couple of times before that. I just didn’t want to make our relationship more complicated than it already was. One day I arranged to meet the guy in the city centre and I told my bf that I was going out with him. To this statement he reacted very strongly saying things like who is this guy, why are you going out with him, does he know you have a bf, etc. Anyway long story short - I went out with the guy three times alone and every other time which was 6 in total afterwards I went out with him and other friends together in a group. My bf never came with us because he was always absent from town including the weekends doing some work on the village house. My last communication with this guy was in messenger at the end of December because I wasn’t in a mood to socialise and go out in winter. My relationship with my bf was very shaky again because of the same issue with his mother and I stopped chatting to the guy. Two weeks ago my bf finally moved in with me, things were ok but one day I left home for a few hours and my bf knows the password to my PC. He decided to invade my messenger and read all the chats for this 1,5 months with the guy. He then printed out everything and told my parents about how I lied to him and that he didn’t wanna see me ever again. He feels hurt and betrayed because I lied to him about the guy. I know that I didn’t tell him about the guy from the beginning but the reason was because our relationship was already very shaky. I also didn’t tell him that I was chatting with the guy regularly for 1,5 months but he doesn’t tell me about his chats either. Now he feels very betrayed and suffers a lot. Did I really do something so unforgivable? How about him invading my chats? Is there anything I can do to make things right?