<human>: Can you succinctly summarize the text in 1-3 sentences?

I have been with her for 5 months, we study at the same graduate school in the same program and have so much in common. We almost live together (50% my place, 50% hers) and feels like we have been together for a long time. It feels serious, it is.

I don't know if I love her, but Im quickly falling for her. I am learning more and more about her past relationships. She seems to have often been in serious relationships and back to back. Several over 1 year. Two lasting over 2 years. The most recent one she was living with him, when living abroad. Most often I feel good about us, I am crazy about her and find she can be sometimes. Other times she seems distant, cold which I am learning is a part of her personality.
At times I am filled with feeling that I don't match up to her past relationships, excitement (her and I both study, not like her past relationship defined by adventure and travelling), sexually, etc. I can be filled with such insecurity I have not felt in a relationships before, I am generally quite confident, but with her I feel so vulnerable and weak.

I have had a few minor relationships, one serious one years ago, but have remained mostly single (anything serious) to wait for the right person and protect myself.

I fully realize I am acting insecurely, maybe jealous (maybe that's not the right word), but mostly inadequate. I think it has to do with my strong feeling for her. Should I be concerned about her and her past relationships (she seems to keep contact with these men casually)? How can I stop acting so self-insecure at times, be better at just enjoying us and not reflecting on her past? Should she have a break from relationships, maybe this never should have occurred, maybe she needs time to be single since her last one ended not so long ago...

For someone who has been in serious relationships and moved on to someone else, how does the previous relationship factor in? Are there measurements, expectations?
<bot>: haven't been in a serous relationship in a while, am getting into one now with someone who has had several serious loving relationships already.