I have a real dilemma.
 
A 'friend' at work (Male) is cheating in his fiance.In fact he is a serial cheater.
He has tried it on with me a few times. (And I am old enough to be his mother!)
He has been having a fling with another girl at work on and off for the last year, (I will call her  HEIDI)ever since his g.friend moved in with him (in Dec 08).
Poor HEIDI  has been quite ill over it all.
She has  lost lots of weight and been on tablets.Sometimes he is full on with her then he appears to have guilt-trips and ignores her for days.
Then he comes back.
Strangely he DOES seem to have feelings for this girl, when he thought she was leaving the company recently he became very upset and
begged her not to go.
I actually collared him about it and asked him why he carries on like this.
He told me that his girlfriend is 'perfect in nearly every way' but she does not enjoy sex and they hardly ever have it.
He said he goes several weeks sometimes (he is 34, his g.freind is 26)
When I told HEIDI this she said that bears out how he is with her.
He gets angry if the sex is over too soon and thumps the bed in anger. (which is a very strange reaction!)
 
He said he even considered going onto an internet dating site to find someone just for sex.
I told him that MOST people on those sites are not just looking for sex, but want a proper committed relationship.
 
As I say he did seem quite smitten with my friend they were good friends for several months before anything physical happened.
He started off begging her for sex "Lets book a hotel room" then seemed happy just to be friends.
However, the relationship then became physical. Now he rebuffs her ..................and then comes on to her . He DOES seem very confused.
I asked him why he does not end the relatiosnhip with his g.friend. He said "I am in too deep".
He also said "I have put my girlfriend through hell over the last 7 years, I am VERY diffcult to live with"  I said "YOU DON'T SAY!"
He has been dating her for 7 YEARS !  and living with her for about a year!
When I was shocked at the length of time he had been with her and not got engaged, he said "I have comittment issues".
 
My friend has now left the company (to get away from him).
Anyway he has just gone on holiday with his girlfriend for 3 weeks.
While he was a way he texted another girl in the office and told her he has PROPOSED to  his girlfriend and she has said 'Yes'.
 
HEIDI is DEVASTATED. Obviously I told her, only because he has tried to keep up contact with her when she left.
So far she has told him she does not want to see him any more.
He did not tell her he was going to do this but did text my  and say "I WILL see you when I get back, you will never get rid of me!"
We have since found out that he has 'chased' other clients/work colleagues.
 
He made a 'big gesture' with his 'proposal'  apparently, booked the ORIENT EXPRESS and ordered an engagement ring he helped design.
 
My main problem is not HEIDI, I think as far as she is concerned it is over.
Should I tell his girlfriend?
She is a young girl and should not be wasting her life on this 'man'.
He has made it quite clear that he will always cheat, said as much to me.
if I tell his girlfriend it WILL  cause imeasurable damage. A few friends have warned me off doing it.
But if it was me I WOULD WANT TO KNOW and the thought that people knew and didn't tell me would be awful.
I feel really wound up over this as I feel something SHOULD be done.
I have considered sending the girlfriend a note and not leaving my name. But I do think this is a cruel way for her to find out.
Also I KNOW he will guess its from me.
 
What do I do?