Me and my Ex-GF Katie meet up every Wednesday and Sunday to go clubbing.
My best friend Chris always comes along. Sometimes without me inviting him.
When ever I go out for a cigaret and she joins me but he comes out with us, even though he doesn't smoke. Where she sits, he sits right next to her.
She laughs at his jokes, even though I made the same joke about 2 days before to her and she don't laugh at all.
When ever it's just me and my Ex, we talk, have fun, laugh and enjoy ourselves. But when Chris comes they always talk to each other and sometimes not talk to me.
Most of the time she arrives at the same time he arrives and sometimes she don't leave until he leaves.
Sometimes ask her "Are you going out with Chris?". She says "No. We are just friends."
Sometimes ask him "Are you going out with Katie?". He says "No. We are just friends."
I don't know if they are secretly together or not.
How can I find out if they are together or not?

Tap his phone...

Explain why it matters to you? I mean, this kind of stuff happens all of the time (I know from experience), especially when your ex still hangs out with you and your friends.

Maybe they're just flirting? All you can do is ask. Unless you want to get into some stocker type stuff.

She is your ex and maybe she is thinking of hooking up with Chris so that is why they seem to be flirting.
If they were dating,it is really not your concern as you are not her BF anymore.
If you can't trust what you BF is telling you than you need to find a new BF.

I am assuming that it was not a bad breakup (cheating, lying, etc) if you are still friends with her. If this is true, then I don't understand why you would object to them dating.

I was not a bad breakup
I want to get back with her.
If the chance of me to get back with her I got with her in is percentages.
If it's just me and her (no Chris) it's 75% after a good day and night.
If it's me, Chris and Katie it's 25%.

1) It shouldn't matter if she's dating someone else. Granted, if she is dating her best friend, then that would be slightly inappropriate on their part.

However, if you keep probing this and keep bothering them about this, it may ruin your friendship with both.

2) You want to get back with her, but apparently you have a 75% after a good day and 25% on a bad day... so your chances of getting back with her depends on a day to day basis? Sorry if this sounds harsh, but that sounds ridiculous. A person's relationship shouldn't vary on a day to day basis.

Quote:

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I got a broken heart and it wont heal after 3 months

Me and my girlfriend Katie went out for about 10 months.
We had arguments, she blamed me for her attitude change.
We broke up about 3 months ago and I still love her.
We still keep in contact and she says "I am still in love with you, but it won't work. Because you act the same reason why I broke up with you".
I keep on saying "I won't".
But she keeps on saying "I am still in love with you, but it won't work."
I keep on saying that it wasn't all my fault that we kept on arguing.
But she blames everything on me.
I can't live with out her right by me.
I don't know what to do.
Can anyone give me advice on how to impress her again?

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This is the background from your original post that was deleted before. Since your more sensible now, and can respond to feed back, then maybe your not a troll, as you seemed to be before.

Sometimes we can't get what we want and even through your ex told you nothing is going on between her and your friend--something is brewing. I am sure you have common sense so you can see the two of them are lying to you or just in denial.

One thing you can't do is stop what is going happen. However, if your uncomfortable with them dating, more than likely your going have to find new friends to hang out with you. I don't know what kind of friendship you have with your friend, not your ex, for him to even attempt to date your ex because sometimes this happens.

You need to find someone out there for yourself because your being friends with her for the wrong reasons right now and only going hurt yourself in the end because your trying to get beyond friends with her.