Your significator is Moon and your interest is 7th ruler, Saturn. They are both moving towards a conjunction here, so looks like you will get together.
His girlfriend would be Venus, she rules both you and him. Yet she is pretty weak, Venus being in detriment at the moment. She is not happy, until she reaches Taurus which happen soon, in less then 3 degrees (weeks, months).
Does she know about you? If she does, or if she suspects something, maybe that's the reason she is in detriment...
If he chooses to be with you, I don't think it will be a longterm relationship. Moon will end up opposing all those planets. Moon has not much dignity, being in its own face only.
Saturn being retrograde shows his hesitation with this. He is unsure if he should take this step. He does also care for his girlfriend as he is in her sign and exalted there. Venus (his girlfriend) will gain in power very soon.
Tread with care....If he is willing to cheat on his girlfriend with you, he will be willing to cheat on you too with someone else. You won't be able to trust him. Just my two cents.
Best wishes!