Lost love!

7 years ago i met a great guy in an internet chat room. after chatting for a few months he came and visited me. we carried on seeing each other for a year, then i moved to his home town with my 3 children from a previous marriage. i knew he had problems when i met him with self harming, but he had gotten help and was over the worst. his family said they would treat my children as their own relatives and were really happy when i fell pregnant a year later. then they stopped paying any interest in my children, even asking me to visit without them, which obviously caused problems. my then, boyfriend started drinking heavily and self harming again. after putting up with this for 6 months i felt i had to move back to my original home town and start afresh with my 3 children and 1 yr old baby. my baby has now turned into a four yr old, and started school this week. now i find myself sitting crying and listening to music that my ex and i shared. although i know i have done the right thing it hurts that my ex hasnt bothered to get in touch and hasnt seen his son since he was 6 mnths old. although i was married before him i truly never loved anyone like i did him, and i dont know if i did the right thing splitting with him. i know its too late now but i havent had a relationship since and i have put on over 4 stone in weight. just want to know if im being stupid or if anyone else has been in a similar situation