another heartbroken/advice

My Gf and i were living together for almost 3 years, we both in love until last month, she told me she's not in love with me anymore, i was shock and confused, things are different she put her cellphones on silent, lots of alibi, so i do some investigation and found out that she's cheating. I know the guy, should i confront him or just wait till i catch them in the act, i have a bad temper, i dont know what to do if i catch the two doing it. pls advice

heartattack, welcome to the forum

Personally I would advise you to just leave your girlfriend and go on with your life in which, I hope, you will meet an honest and respectable girl that is worthy of you. Cheating on a partner is a very low thing to do and such persons shouldn't be worthy of any spilled energy on them, whether by getting angry, sad or whatever. Just drop her.

but i love her so much...partly, it was my fault i was neglected her, she asked me to do things but i ignore it, now i'm doing most of the chores in the house. because i was trying to save this relationship for 3 weeks now, i know she still care and love me but beacuse there's another guy involved that's why i think she's confused. the guy is her friend at work,i was thinking should i call the guy and pretend that i'm asking for help, instead of confronting him.

Heartattack, do what you feel is right. In my personal opinion this guy hasn't got anything to do with it. If she could cheat with him she could have and still can cheat with anybody. So, he is not important at all. It is HER you should address.