Please advice on how do I need to change myself

i have so much to say, but i have no one who can understand me. it happened when i were in my 1st year at uom, a boy proposed me. we were serious, and i introduced him to my family. we got engaged after 2 years of knowing each other. However, we were not ready to get married due to our financial situation. As time goes by, we became so used to each other, that his ways of caring n loving me started to fade out. He stopped doing things that we used to do before. i thought maybe he was busy with his new job. However, after 1 year, i learnt that he was betraying me with another girl at his work. I had to stop the relationship. I were so hurt and didnt believe in love. It was so painful since all the people in the society had known about the breakup. I had to hear all sort of talks from people around me. However, after everything became normal, i continued live a normal life, even though i were deeply hurt inside. One day, a boy approched me. i were so alone and wanted to forget about my past. It happened that we fell in love with each other. Again, history repeats itself, we introduced each other to our family, and last year we got engaged. since then, i noticed that he has changed. He does not behave the same way he used to when we first knew each other. He always use foul language with me, always irritated, n told me frankly that his friends and family are his priorities. he always lie to me about any small things he does. He considers his friends and family to be more important than me. Caring and loving me has almost fade out. going out just me and him does not exist anymore in the relationship. I feel so hurt inside. I have always been sincere to any these 2 only boys that i had known through my entire life. I would like to hav some advice on how i could change myself so that i can handle this relationship better