No you can't interfere. The dad is going to be around. It is his kid. You can't ask him to not have contact with them. Just enjoy your time...
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You really need to seek professional help.
It's possible she might reconsider... why does she feel you are too different now? She didn't seem to think that a couple weeks ago
The first step is just to get over the shyness. Find some reason to talk to her. I know that is easier said than done. It's best to just talk...
Get out while you can. You are still young so there likely isn't much to split up, no kids makes it easy.
Have you considered doing some couple sex therapy?
If he isn't giving you the attention you need, move on.
She is a drug addict and a prostitute... yeah you need to find someone else
I would completely move on. You told him how you feel and you didn't get the response you wanted. Sounds like he just wants to be friends... but...
first step is to talk to her and get to know her a little
How long is she in America for?
... and I would make paragraphs out of that
From your description, it really sounds like she isn't interested in you. Nothing you do is going to change that even if you lived close. The...
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