Why am i like this??

Whenever a older married man say around late 30s to 40s trys to help me out with anything, i always end up sexually attracted to them and end up sleeping or kissing them, why does this happen?
My best mates dad was like a dad 2 me but then i started to have feelings for him and we had an affair but it stopped because i moved away. My boss was always there for me could talk to him about anything and helped me through alot, same thing happpend.
A close police man friend helped me through alot and know im sexually attracted to him, and theres been quite a few others.
do you think maybe its because when i was 13 my youth leader who i was really close to started touchig me and we had an affair?
Also i got my heart broken terribly by a bf when i was 16 and never been able to have a relationship thats lasted longer then a month now.
Also suffered severe depression.
Why am i like this??