Help I need advice I might wrecked a marriage

My ex and I been together for almost 3yrs. Until he went to abroad 2011. We had long diatamce relationship for almost a year and weve been clear how.much we love each other however there are circumstances that we cannot avoid. He was very honest for leaving me and opted to see someone 2012 and planning to get marry someone because his undocumented. The time he left me he said I should move on follow my dreams and hoping I focus on my dreams and hoping i may not have relationship yet. For him he needs to break up with me even though he love me because he needs it and also he wants to give a new relationship a chance. When we broke up he blocked me in all our communication I was not also able to say my piece. I was left hanging. Since i cannot contact him in anyway I found someone easily I can say more of a rebound but I got pregnant 2013. During pregnancy my thoughts are for my ex I still love him. Until I knew from a friend that indeed he got married. So by that time I also tried working out of the relationship for the father of my child until I gave birth 2013. The father of my child helping financialy but our relationship is whirlwind bcause he has vices. When I gave birth suddenly me and my ex got in touched. He was very surprised I have a baby after less than a year he broke up with me... We talked about things.. him being married happily and also im sayings things that I am also happy. Our communication was very frequent from Dec. 2013, 2014, and 2015. During 2015 he started talking about our past until hw told me he only married because he was undocumented but he loved the girl however time goes by he said they are not compatible and they fight most of the time though I can sense that he still loves me I was very clear that even im.not yet married I am very happy with my family even it is a lie...because i was living with all fights as well. Until 2015 of Nov. I flew abroad and leave my daughter and partner to work. 2016 came and a lot of problmes arises between me and my partner that i decided to have my daughter send to my parents instead of my partner. My ex and I still communicate and told him about the truth of whata going on with my life..he also shared that they might have divorce with his wife because his wife been abusing him verbally if they have arguments until such time that we opened up feelings that still there...
Its just that Im guilty I dont know if its still right that we communicate he still married and my partner and I are still hanging...I still love my ex. But i did nit express it though his expressing his love to me i just always say that its nit right and we should stop but the more time goes by the more we long for each other and evrytime he will tell me that they have a fight it makes me think ita because of me. I dont know what to do.