How do I keep my cool with gf erratic behavior?

[Edgar O]

My gf has depression and has been seeking professional help for about 3 months now. recently she's been doing things to push me away then apologizing alot. Our relationship used to be alot easier until about a month ago, we have been long distance relationship since the start which makes things hard but we have made frequent visits to see each other and have travelled together when we have the time. I've known about her depression ever since we started going out about 7 months ago. I know she really cares about me and I care deeply about her. but recently she's been doing things like drunkly messing around with another guy at a party and telling me she needs space to my face after I travelled all the way to see her (and she told me she was excited to see me). I know the depression is a tough struggle and I need to support her however I can (and I always give her space when she needs this). I just dont want her to keep on hurting me. and everytime I want answers she just says sorry wishes she didnt do the things she does. I've forgiven her for what she has done to me but I still feel so hurt by her immaturity. How can I handle a depressive's irrational behavior? oh btw we're both College adults so this isnt some dumb tween relationship question.