Relation with a Married guy and um Single!!!?

Ok to cut the whole thing short i must tell you it's a continue question from my previous question "Does he actually likes me or he is just looking for sex?"

I met the guy on December 19th 2014 finally. When we met for first time never thought how will be the reaction but it surprised me a lot. He basically fall for me. Now worst part. He is not separated, he is married with 2 kids. And we met for 2 weeks but he didn't try to drag me to bed!! When he returned to London what he told me surprised me a lot. Because I was basically insisting him to have sex! He said if he had sex with me and later his tricky mind makes him to leave me then I will get hurt which will be hard for him now to take!! I am pretty younger than him and he really loves my face and me as well. He asks for my photo every day(normal work day look selfies). His behaviour improved dramatically when he returned. He never called me without Viber before but this week my net was giving trouble and the whole day he called me for 4 times!!! More over the biggest surprise was, he was asking for my home address. When i asked why he need it. Then he said he wanna send me something for my Birthday. I thought it will be something lingerie type things. But it was a damn diamond ring!! A big one!!

What the hell is going on?!!! He is not going to leave his family i knw but he seem to be misses me a lot. In my previous relation I had a BF with whom i spent 6yrs and he never gave me anything expensive like that!!!