problems...mentally HELP ME PLZ

[IALuder]

ok, heres the deal. i went to go get signed up for college. its a rather small college. 20 people in a class room small. less then 6K students if that.

well i was sitting waiting for my tour guide. well they have a class room by the lobby. im sitting there and BAM right when i looked up i seen my ex-gf walking out. she didnt see me, or i dont think she did. we were almost 50-75 feet away. never made eye contact. i never knew she went there. well actually i forgot she was going to go there. i went with her to her registration and sign up.

after i saw her i cant stop thinking of are relationship. not her in general, but she comes up all the time. the thing is it was my worst and longest relationship. 6-7 months, of bitching nagging mean abusive 5 yr old acting bitch. but the stuff in bed was good. i dumped her after everyone made me realize what i was ignoring, didnt want to realize.

i dont know why im thinking of her and the relationship all the time. its like every 10 mins it come up in mind. everytime i think of it i go why am thinking of this, im never going to date her agian. i wont let myself make that mistake twice.

WHY, MUST I KEEP THINKING OF THIS? WHY?