I was going out with a French guy for 2 years. At first it was just visiting him for holidays then I moved away from England to live with him. It was fantastic, we had so much in common.  We would laugh at everything.  The thing is he works away a lot, in lots of different countries, so I settled down in France and he went off to Russia for 3 months.

I know loads of people who have had relationships with people who live away.  I only know one relationship that has lasted that way.  And in that particular relationship she goes away with him to most (not all) the countries he travels to.  To me I would hate to be in this sort of relationship.  A relationship needs two people to be their for each other for the good times and bad times in life. 

If one partner is living away for most of the year, to me it is no longer a relationship.  That person can change when they are away, the person left at home can change.  When the traveller returns, neither can adjust to being back together again for long periods of time.  When they are away, they meet knew people and have a different sort of life and see different cultures, and ultimately they are going to change as a result. 

People can not do without the companionship and sex for long periods.  So neither the person at home or the person travelling can cope very well without their partner.  As a result one or the other or both tend to find another partner to fill in that void.

He phoned everyday and texted that he loves me everyday. 

I spent a lot of time away in France in my teens.  What I found is that English men very rarely say "I love you" (they are almost scared of saying it) and certainly don't tend to say it if they don't mean it or can avoid saying it.  French men say "I love you" far too often (and are not scared of saying it), and therefore you can't tell whether they are genuine or not, because they are so used to saying it.

Then he came back and was very strange.  Sex was OK, but not the same.  And he would just stare, not talk.

This is the problem I mentioned above.  When someone is away for a long period of time.  It gets to the point where neither people know each other that well, or know what to say to each other.  They get used to their other life, where they are separate from each other.

Then I found a love letter from a russian girl and it killed me I fell to pieces. I tried to keep strong. He told me that she was pretty, not as pretty as me, but she has touched his heart and he wants to bring this girl to France.

Alarm bells start ringing, of a Russian woman, using a guy to get a better life in France.  But, hey that is up to his judgement.

So I got strong and said do what you want but I think you would be stupid to bring her here. Anyway he said to me if you found another guy he would be very jealous and that he doesn't want me, but he can't let go of me either. 

Sounds like he is not quite sure what he wants to do.  Not sure whether this Russian woman, will work out, so wants to keep you in his pocket, in case it doesn't work out.  He probably even wants to have the both of you on the go at the same time.  Which in effect he already has, he's got her in Russia and you in France.  While it's every man's dream to have more than one woman, it is not right and not fair to you.

I love him so much. What can I do?

The way I see it, he doesn't value your relationship enough, to question whether to bring this Russian woman over with him.  He is not treating you right.  He doesn't love you enough.  You are not having the fun times you were having before.  He even offers you a get out clause of finding another man.  He's not a long term relationship prospect anyway because he spends most of his time working away.  You want a guy who you can spend the rest of your life with, through good times and bad times.  There are only two words I can think think of here "Ditch him".  It is easy for me to say that, but that really is your best option.