Is it normal i fear dating?

i fear dating, i don't fear women in general i have dated in the past although i have a horrible habit of running into the clingy/insane types the ones that are all "if i can't have you no one can" those women who will pull out a stake knife on your ass if you even think about leaving them.

recently i had my 3rd run in with a total nutcase, i found out she cheated on me by one of my friends and when i confronted her and told her i wanted her to pack her things and get out she started denying it even though i had the trustful word of my friend i've known since elementary school who has never lied to me after about 10 minutes of arguing we ended up in the kitchen and she reached and unsheathed one of the stakeknives we have beside our fridge and took a slash for my neck, luckily i moved out of the way enough so that it only sliced my chest slightly i picked up the microwave that was near me (it was the only heavy object near me and i feared for my life) and threw it at her, it hit her in the head knocking her out cold. i proceeded to call 911 and now she is in court on trial for attempted murder and hopefully face life in prison, i can only wish the worst for her now i'm going to have a scar across the left side of my chest that will never heal completely... (i have stitches)

i realize that the majority of girls are not like this, but its really hard for me to tell the crazy ones from the proper ones until it's too late and i guess i've developed a phobia of relationships.. and stake knives ._.

is it normal after i went through all that to fear relationships and never want to date again for the rest of my life?