Can we forget our first love ?

I dont think so, I got married in november, and as bad as it sounds I think of my first love everyday, I miss him so much, we seperated only because it felt like we were growing apart, he liked to go out and i liked just really bring home, we were together 4 yrs. Now I am 8 months pregnant, and the pther day he wrote my email and said how he missed me and thought of me everyday, which was wierd because I am the same I think of him everday, I feel aweful because now I am married. I married my husband because he was a good person, and I liked that alot. But now I feel so sad because everday since I have missed and thought of my ex, and now I know he thinks of me which makes everything so much worse. I wouldnt leave my husband, but at times wish I could because my ex and me were more than best friends and a couple, I just wish we could of tried harder. I havent respnoded to his email, tho my heart is crying to respond and tell him how much I miss him and love him.