Hi,
Let's examine the facts:
1. You love him.
2. You want him back.
3. For some reason your previous
relations came to an end.
4. He fell in love with another girl.
5. Their relations didn't develope
well and seem to end.
6. He still loves and wants her.
7. If he returns to you it will be for
good (marriage),
However that means:
1. He is still emotionally involved with her.
2. You are the 2nd best (an altrernative).
3. Good chances that he'll cheat (sooner
or later).
What should you do:
Tell him that you don't wish to be his 2nd choise. If he really wants you than he'll have to finish all his relations with that other girl and commit himself entirely to you. If he does it you'll be happy to return to him, on one condition: No more "other girls". Only if that occures than you have good chances to build good relations with him.
Best regards,