I can't fall in love anymore

I have been thinking so damn hard lately about how I could love so damn hard with my first love in highschool. I gave him my everything all my energy and i deeply loved the crap out of him... we could hace sex for hours......fast forward... I'm with my fiance now and we have a 18 month old boy. lifes busy, were living a busy life. both full time jobs..we make the same amount of money...have a house. we have a dream at just 21 and 23 years old. i justhave a hard time truly loving him...we barely and i mean never have sex (once a month id say)....idk if its because ive been through so much that I'm just broken inside but I do not feel anything remotely close to my first real love. I sound so harsh but I'm just heartbroken because i want to love my fiance sooooo much he deserves it more than my highschool sweetheart obviously. is it normal... maybe a different kind of love? my fiance has hurt me ovet and over while i was pregnant and i think it really traumatized me and im still so hurt by it.