My husband is secretive and dishonest?

My husband and I got married in August last year. After two months of our marriage, one day he did not come home until 6 in the morning. I grew suspicious about his where abouts and therefore checked his phone. I noticed that there was a number which he called around Midnight and that same number called him around the time he arrived home. He saved it with the name Sara. When I asked him which Sara that was he said his friend was using the phone and could have probably saved the number in his phone. I later on discovered that he was lying and in fact he was with that girl during the night. He apologized for lying and insisted there was nothing going on with the girl and that they just met through a friend and had just gone together to a club that night. He promised to cut contact with the girl but after a few days I found out that he had deleted the number from his phone but had written it on a small piece of paper with a male name. When I comfronted him, again he was apologetic and promised that he will never do that again. After 5 months he went to another country on Business for about 1 and half weeks. When he came back I noticed he was guarding his phone but I still noticed he was getting calls from that country and was deleting the histories, he later on put a secret code on his phone. Later on a girl from that country started stalking me on facebook. She then wrote my husband addressing him as Sweetheart asking him why he had started avoiding her. When I asked my husband about the girl he indicated that he knows the girl and that they had met during his trip. Again he denied anything going on between them. He again lied to me that since he came back he had never been in contact with the girl. I found evidence that they have been talking on the phone hence his guarding the phone and deleting the histories. When I comfronted him with the evidence that's when he told the Truth about them talking on the phone but indicated that the girl was the one interested in him and that he was not interested in the girl. I am confused. I feel like in both instances my husband was cheating with these girls because i wonder why he lies if these were honest encounters. He is again apologetic and says it will never happen again. I do not believe him for he has done this twice within our 7 months of marriage. I love my husband but now can no longer trust him. I wonder if our marriage has a future at all. Note that my husband tell alot of lies even on little unnecessary things. I am confused and don't know what to do.